feat(chat): save by default + share anonymously — auto-saved chats, guest-facing Share, success toast, action row

app/api/chats.py

@@ -1,9 +1,22 @@
 """Saved-chat API — save and view chat history (phase 50, task 02).
 
-Admin-only CRUD under ``/api/chats`` (the phase-16
+Split gate (phase 55, task 01 — owner-locked A1, superseding the
-:func:`app.core.auth.require_admin` gate, applied router-wide exactly
+phase-50 "save/history is admin-only" lock): under ``/api/chats`` the
-like :mod:`app.api.steering`): conversations the owner explicitly
+WRITE surface is **public** (no session) — ``POST`` (create, including
-**Saves** are stored in Postgres (``saved_chats``, migration 0008).
+the save-then-share ``share: true`` branch), ``PUT /{chat_id}`` (the
+re-Save upsert), ``POST /{chat_id}/share``. WHY: a save is the
+visitor's OWN conversation; the row id is an unguessable ``uuid4``, the
+same trust model as the phase-51 share token — the id/token IS the
+credential (a guest holds the handle to what they just saved, exactly
+as a link-holder holds a token). The MANAGEMENT surface is
+**admin-only** and keeps the phase-16 :func:`app.core.auth.require_admin`
+gate — applied per-route on exactly those four decorators (list,
+detail, delete, unshare — the owner's History surface; the
+:mod:`app.api.steering` router-wide pattern is untouched). Guest chats
+appear in the admin's History (saved by default — phase 55).
+
+Conversations are stored in Postgres (``saved_chats``, migration
+0008).
 
 A10 extension (owner permission 2026-08-29, recorded per AGENTS.md
 rule 3 — a recorded revision, not a silent deviation): ``/api/chat``
@@ -27,8 +40,9 @@ PENDING row so it ships in the same INSERT),
 only when supplied; re-stamps ``sources_version`` to the current
 generation — a Re-Save is the owner affirming this content against
 the current KB), ``DELETE /{chat_id}``, and (phase 51, task 01)
-``POST /{chat_id}/share`` / ``POST /{chat_id}/unshare`` on this
+``POST /{chat_id}/share`` (public, phase 55) /
-admin-gated router.
+``POST /{chat_id}/unshare`` (admin-only — the owner's History
+action).
 
 Staleness (phase 53, task 03): every saved row carries the
 ``sources_meta`` generation it was saved against (``sources_version``,
@@ -82,10 +96,12 @@ from app.schemas import (
     UnshareOut,
 )
 
+# Phase 55, task 01 (owner-locked A1): NO router-wide gate here — the
+# write surface (create / re-Save / share) is public; exactly the four
+# management routes below carry ``dependencies=[Depends(require_admin)]``.
 router = APIRouter(
     prefix="/chats",
     tags=["chats"],
-    dependencies=[Depends(require_admin)],  # phase 16: save/history is admin-only
 )
 
 #: Auto-title cap (owner-locked convention, phase 50): the first user
@@ -151,12 +167,18 @@ def _to_row(row: SavedChat, current_version: int) -> SavedChatRow:
     )
 
 
-@router.get("", response_model=SavedChatList)
+@router.get(
+    "",
+    response_model=SavedChatList,
+    dependencies=[Depends(require_admin)],  # management surface (phase 55)
+)
 def list_chats(
     db: Session = Depends(get_db),  # noqa: B008
 ) -> SavedChatList:
     """All saved chats, latest activity first (``updated_at desc, id
-    desc``) — the History page's table order. Each row carries the
+    desc``) — the History page's table order, admin-only (the owner's
+    History surface; phase 55 moved the gate per-route). Each row
+    carries the
     phase-53 ``stale`` flag: the current generation is read ONCE per
     request (one PK read of the seeded row) and compared against every
     row's stamp in the serializer helpers — no per-row queries."""
@@ -174,6 +196,10 @@ def create_chat(
 ) -> SavedChatOut:
     """Store one explicitly saved conversation (201).
 
+    PUBLIC (phase 55, task 01) — no session required: the save is the
+    visitor's own conversation; the unguessable ``uuid4`` row id IS the
+    credential (the phase-51 token's trust model).
+
     Auto-title when ``title`` is absent/blank: the first user message's
     text, whitespace-collapsed, truncated to 120 chars (owner-locked
     convention); a conversation with no user message (defensive) falls
@@ -217,13 +243,18 @@ def create_chat(
     return _to_out(row, current_version)
 
 
-@router.get("/{chat_id}", response_model=SavedChatOut)
+@router.get(
+    "/{chat_id}",
+    response_model=SavedChatOut,
+    dependencies=[Depends(require_admin)],  # management surface (phase 55)
+)
 def get_chat(
     chat_id: uuid.UUID,
     db: Session = Depends(get_db),  # noqa: B008
 ) -> SavedChatOut:
-    """One saved chat, full payload (the ``?chat=<id>`` load); 404 when
+    """One saved chat, full payload (the ``?chat=<id>`` load) —
-    the id is unknown. The ``stale`` flag (phase 53) tells the chat
+    admin-only (the ``?chat=<id>`` boot restore is the owner's "Open"
+    action, phase 55 A3); 404 when the id is unknown. The ``stale`` flag (phase 53) tells the chat
     page whether to reveal its stale banner (task 05) before the
     messages render."""
     row = db.get(SavedChat, chat_id)
@@ -240,6 +271,10 @@ def update_chat(
 ) -> SavedChatOut:
     """Re-Save upsert: full ``messages`` replacement on the same row.
 
+    PUBLIC (phase 55, task 01) — no session required (the auto-save
+    upsert for the visitor's own conversation; same row-id trust model
+    as :func:`create_chat`).
+
     ``title`` is replaced only when supplied (an absent/blank ``title``
     keeps the current one); 404 when the id is unknown. ``updated_at``
     bumps via the model's ``onupdate=func.now()`` — the attribute
@@ -269,12 +304,17 @@ def update_chat(
     return _to_out(row, current_version)
 
 
-@router.delete("/{chat_id}", status_code=204)
+@router.delete(
+    "/{chat_id}",
+    status_code=204,
+    dependencies=[Depends(require_admin)],  # management surface (phase 55)
+)
 def delete_chat(
     chat_id: uuid.UUID,
     db: Session = Depends(get_db),  # noqa: B008
 ) -> Response:
-    """Remove a saved chat; 404 when the id is unknown."""
+    """Remove a saved chat — admin-only (the owner's History action,
+    phase 55); 404 when the id is unknown."""""
     row = db.get(SavedChat, chat_id)
     if row is None:
         raise HTTPException(status_code=404, detail="unknown chat")
@@ -290,6 +330,11 @@ def share_chat(
 ) -> ShareOut:
     """Turn a saved chat into a public link (phase 51, task 01).
 
+    PUBLIC (phase 55, task 01) — no session required: sharing is what
+    the visitor does with their own conversation (the row-id trust
+    model of :func:`create_chat`; revoking, by contrast, is the
+    owner's History action — :func:`unshare_chat` stays admin-only).
+
     Returns ``{"chat_id", "share_url"}`` with ``share_url =
     "/shared/<token>"`` (200, idempotent — an existing token is
     returned unchanged; a new token is a 128-bit ``uuid4``).
@@ -317,13 +362,20 @@ def share_chat(
     return ShareOut(chat_id=row.id, share_url=f"/shared/{token}")
 
 
-@router.post("/{chat_id}/unshare", response_model=UnshareOut)
+@router.post(
+    "/{chat_id}/unshare",
+    response_model=UnshareOut,
+    dependencies=[Depends(require_admin)],  # management surface (phase 55)
+)
 def unshare_chat(
     chat_id: uuid.UUID,
     db: Session = Depends(get_db),  # noqa: B008
 ) -> UnshareOut:
     """Revoke a shared chat (phase 51, task 01): ``share_token`` → NULL.
 
+    Admin-only (the owner's History action — phase 55 kept the
+    revocation off the guest's reach, so a guest cannot un-revoke).
+
     Idempotent — an unshared chat unshares cleanly (200, no write).
     ``updated_at`` is not bumped (raw SQL ``UPDATE`` touching only
     ``share_token``, same reasoning as :func:`share_chat`); 404 when

frontend/assets/app.js

@@ -124,44 +124,54 @@
  * while a turn is in flight. No banner, no scroll (phase 42): the fresh
  * bubble lands where the old one was.
  *
- * Save the conversation (phase 50, owner-locked 2026-08-29, TODO.md L5):
+ * Auto-save the conversation (phase 55, owner-locked A2, 2026-08-31 —
- * the "Save" pill (#save-chat-btn — admin-only, SHIPS HIDDEN, revealed at
+ * the phase-50 Save pill is RETIRED, TODO.md L4 "Save shouldn't be a
- * boot only for admin: absent, not hidden, for anonymous) stores the
+ * button"): every conversation upserts itself into Postgres
- * CURRENT conversation in Postgres (saved_chats, migration 0008) through
+ * (saved_chats, migration 0008) at the persistence save points — no
- * the admin-only /api/chats CRUD. Upsert semantics keyed by
+ * button, no explicit action. The headless persistConversation() helper
- * `currentChatId` (module scope, string | null): a Save while unlinked
+ * carries the phase-50 upsert semantics, keyed by `currentChatId`
- * POSTs /api/chats (the server auto-titles from the first question,
+ * (module scope, string | null): a save while unlinked POSTs /api/chats
- * 120-char cap) and links the conversation to the created row's id; a
+ * (the server auto-titles from the first question, 120-char cap) and
- * re-Save while linked PUTs the SAME row — the same conversation never
+ * links the conversation to the created row's id; a save while linked
- * spawns a second row; a 404 from that PUT (the row was deleted on the
+ * PUTs the SAME row — the same conversation never spawns a second row;
- * History page behind our back) unlinks and retries as a create, so a
+ * a 404 from that PUT (the row was deleted on the History page behind
- * stale link can never leave the conversation unsaved. "New chat"
+ * our back) unlinks and retries as a create, so a stale link can never
- * unlinks (a fresh conversation is unlinked until saved again). Boot
+ * wedge the conversation. The module-level `persisting` flag is the
+ * double-fire guard: the save points can overlap (pagehide during a
+ * stream), so a call while an upsert is in flight is a no-op — the
+ * next save point retries. The A2 quiet contract: a FAILED auto-save
+ * never blocks the conversation — a one-line #send-status note ("Couldn't
+ * save automatically — will try on the next message."), NO error banner;
+ * a SUCCESSFUL auto-save is silent (the History page is the visible
+ * proof — the toast is reserved for share). The row link survives
+ * reloads: the bor.chat.v1 record carries `chatId` (null when unlinked;
+ * a pre-55 record without the field reads as null — never throws), so a
+ * refresh restores the conversation AND its link. "New chat" unlinks
+ * (a fresh conversation creates a fresh row on its first message). Boot
  * load: /?chat=<id> with a VALID uuid AND admin fetches the row and
  * renders its messages through the SAME renderStoredMessage loop as the
  * phase-14 local restore (sources / thinking / tools / stopped /
  * deflection — pixel-identical), links currentChatId to the id, and
  * mirrors the conversation to localStorage (a plain refresh returns to
- * it the phase-14 way). The ?chat= param is a ONE-SHOT boot instruction:
+ * it the phase-14 way, link included). The ?chat= param is a ONE-SHOT
- * the success path normalizes the URL back to / (history.replaceState),
+ * boot instruction: the success path normalizes the URL back to /
- * so a later refresh — or a "New chat" + refresh — restores the LOCAL
+ * (history.replaceState), so a later refresh — or a "New chat" +
- * session (the mirror) instead of re-opening the saved row and evicting
+ * refresh — restores the LOCAL session (the mirror) instead of
- * whatever the owner typed since. Invalid/absent param, anonymous (no
+ * re-opening the saved row and evicting whatever the owner typed since.
- * fetch — the gate would 403), 404, or network failure: the normal local
+ * Invalid/absent param, anonymous (no fetch — the gate would 403), 404,
- * restore runs instead (404/network also raise the error banner). Save
+ * or network failure: the normal local restore runs instead (404/network
- * feedback
+ * also raise the error banner). Phase 14's local persistence is
- * is status text only ("Conversation saved." / "Nothing to save yet.")
+ * untouched: auto-save is an additional, automatic upsert.
- * — the #send-status live region, never stale (PLAN §7.4); failures get
- * the error banner. Phase 14's local persistence is untouched: saving is
- * an additional, explicit action.
  *
  * Share the conversation (phase 51, owner-locked 2026-08-29, TODO.md
- * L6): the "Share" pill (#share-chat-btn — admin-only, SHIPS HIDDEN,
+ * L6 — visible to EVERY visitor since phase 55 task 03: the pill is
- * revealed at boot in the SAME admin-reveal block as Save) turns the
+ * static, always-visible markup with no reveal step, and the write
- * CURRENT conversation into a public read-only link (/shared/<token>,
+ * surface is public — task 01): the "Share" pill (#share-chat-btn)
- * a 128-bit uuid4 on the saved_chats row). The save-then-share
+ * turns the CURRENT conversation into a public read-only link
- * contract: the SAME empty-conversation no-op guard as Save (live
+ * (/shared/<token>, a 128-bit uuid4 on the saved_chats row). The
- * region, no request); linked (currentChatId set) → POST
+ * save-then-share contract: the same
+ * empty-conversation no-op guard as the auto-save (live region, no
+ * request); linked (currentChatId set) → POST
  * /api/chats/<id>/share (idempotent — the existing token comes back
  * unchanged); unlinked → POST /api/chats with { messages: conversation,
  * share: true } and link currentChatId to the created id — one action
@@ -173,9 +183,15 @@
  * input-like that selects its full URL on focus, .share-link-fallback)
  * and the live region reads "Share link ready — copy it from the
  * field." (the owner-locked fallback). Success (clipboard) reads
- * "Share link copied." 403/5xx → the actionable error banner (signed-
+ * "Share link copied." Phase 55 task 04 (owner-locked A4): BOTH
- * in hint, like Save); a network failure → the "is the app reachable?"
+ * success paths ALSO raise the visual-only share toast (showToast —
- * banner.
+ * top-right slide-down, auto-dismiss ~4s, single instance; the node is
+ * aria-hidden, so the #send-status live region remains the sole a11y
+ * announcer — no double screen-reader read); a failed share NEVER
+ * toasts (the error banner is the failure UI). 403/5xx → the
+ * actionable error banner (neutral "try again" — with a public write
+ * surface a 403 is no longer a sign-in problem for a guest, phase 55
+ * task 01); a network failure → the "is the app reachable?" banner.
  *
  * Stale saved chats (phase 53, TODO.md L4): every sync that changes the
  * knowledge base bumps the sources generation; a row saved against an
@@ -192,16 +208,16 @@
  * runTurn promise so the handler can await the turn's completion
  * (behavior-neutral for the existing Retry click, which ignores it).
  * Only when the turn completes WITHOUT the error banner does the handler
- * persist the linked row through the SAME upsert as Save — PUT
+ * persist the linked row through the SAME upsert as the auto-save — PUT
  * /api/chats/<id> (the server re-stamps sources_version → stale: false);
  * a 404 (row deleted from History meanwhile) unlinks and recreates
- * (saveCurrentChat's stale-link rule). A regenerate that errors
+ * (persistConversation's stale-link rule). A regenerate that errors
  * mid-stream leaves the row untouched (stale stays true); a regenerate
  * STOPPED mid-stream (phase 48) persists the stopped partial. Success
  * hides the banner and announces in the #send-status live region
  * (PLAN §7.4 never-stale). The banner also clears on "New chat" and on
- * a successful manual re-Save (both make the row/conversation no longer
+ * a successful auto-save re-stamp (both make the row/conversation no
- * the one the banner describes).
+ * longer the one the banner describes).
  *
  * All DOM ids match frontend/index.html.
  */
@@ -225,8 +241,9 @@ const sendStatus = document.querySelector("#send-status");
 const banner = document.querySelector("#kb-banner");
 const bannerText = document.querySelector("#kb-banner-text");
 const versionEl = document.querySelector("#app-version");
-const saveBtn = document.querySelector("#save-chat-btn"); // phase 50: admin-only Save pill (ships hidden)
+// Phase 55 (A2): the phase-50 #save-chat-btn query is GONE — there is no
-const shareBtn = document.querySelector("#share-chat-btn"); // phase 51: admin-only Share pill (ships hidden)
+// Save control; persistConversation() auto-saves headless at the save points.
+const shareBtn = document.querySelector("#share-chat-btn"); // phase 55 task 03: Share pill — static markup, visible to every visitor
 const staleBanner = document.querySelector("#stale-banner"); // phase 53: the stale banner (ships hidden)
 const staleRegenBtn = document.querySelector("#stale-regenerate"); // phase 53: the banner's Regenerate pill
 
@@ -499,15 +516,15 @@ function openTuneForm(wrap, toggleBtn) {
               placeholder="e.g. be more concise — or: assume I'm on NixOS"></textarea>`;
   const actions = document.createElement("div");
   actions.className = "tune-form-actions";
-  const saveBtn = document.createElement("button");
+  const tuneSaveBtn = document.createElement("button");
-  saveBtn.type = "submit";
+  tuneSaveBtn.type = "submit";
-  saveBtn.className = "tune-save";
+  tuneSaveBtn.className = "tune-save";
-  saveBtn.textContent = "Save";
+  tuneSaveBtn.textContent = "Save";
   const cancelBtn = document.createElement("button");
   cancelBtn.type = "button";
   cancelBtn.className = "tune-cancel";
   cancelBtn.textContent = "Cancel";
-  actions.append(saveBtn, cancelBtn);
+  actions.append(tuneSaveBtn, cancelBtn);
   form.appendChild(actions);
   const status = document.createElement("p");
   status.className = "tune-error";
@@ -517,7 +534,7 @@ function openTuneForm(wrap, toggleBtn) {
 
   form.addEventListener("submit", async (e) => {
     e.preventDefault();
-    saveBtn.disabled = true;
+    tuneSaveBtn.disabled = true;
     status.hidden = true;
     try {
       const r = await fetch("/api/steering", {
@@ -537,7 +554,7 @@ function openTuneForm(wrap, toggleBtn) {
         } catch { /* non-JSON error body */ }
         status.textContent = detail;
         status.hidden = false;
-        saveBtn.disabled = false;
+        tuneSaveBtn.disabled = false;
         return; // form kept on failure — the instruction survives
       }
       const saved = document.createElement("p");
@@ -550,7 +567,7 @@ function openTuneForm(wrap, toggleBtn) {
     } catch {
       status.textContent = "Could not save the note — is the app reachable?";
       status.hidden = false;
-      saveBtn.disabled = false;
+      tuneSaveBtn.disabled = false;
     }
   });
   cancelBtn.addEventListener("click", () => {
@@ -938,11 +955,16 @@ function appendMaybeTry(wrap, suggestions) {
  *
  * A durable LOCAL session (A10 unchanged: the API stays stateless — the
  * server stores nothing about the conversation). The whole conversation
- * lives in localStorage under a versioned key; a format bump = clean start:
+ * lives in localStorage under a versioned key; a format bump = clean start.
+ * Phase 55 (A2): the shape extends IN PLACE with `chatId` — the
+ * saved_chats row link, so a reload restores the conversation AND its
+ * link (the same conversation never spawns a second row). A pre-55
+ * record without the field reads as null (unlinked) — never throws:
  *
- *     bor.chat.v1 → { v: 1, messages: [{ who: "user"|"brain", text,
+ *     bor.chat.v1 → { v: 1, chatId: string | null,
- *                                        sources?, deflected?, suggestions?,
+ *                     messages: [{ who: "user"|"brain", text,
- *                                        thinking?, tools?, stopped? }] }
+ *                                  sources?, deflected?, suggestions?,
+ *                                  thinking?, tools?, stopped? }] }
  *
  * Only RAW TEXT is stored — restore re-renders it through the escape-first
  * markdown renderer, so no HTML is ever persisted. Save points: the user
@@ -952,7 +974,9 @@ function appendMaybeTry(wrap, suggestions) {
  * optional `stopped` marker; a pre-token stop persists nothing
  * brain-side), and the PARTIAL brain message on navigate-away (`pagehide`,
  * phase 20 — an in-flight turn keeps whatever had already streamed;
- * thinking-only turns persist nothing brain-side). Every localStorage access
+ * thinking-only turns persist nothing brain-side). Phase 55 (A2): every
+ * save point ALSO auto-saves the row — persistConversation() (headless,
+ * quiet on failure, silent on success). Every localStorage access
  * is try/catch'd — private mode or quota exhaustion degrades silently to
  * in-memory-only chat. If the serialized state outgrows the budget (~700k
  * chars, far under the ~5MB quota) the oldest messages are dropped first.
@@ -963,23 +987,32 @@ export const STORAGE_BUDGET_CHARS = 700_000;
 
 let conversation = []; // in-memory copy of the persisted messages
 
-function loadStoredConversation() {
+/* The stored record — { chatId, messages } or null. Phase 55 (A2): the
+ * row link rides the record so a reload restores it. `chatId` is
+ * OPTIONAL by contract (old-record safety): a pre-55 record without the
+ * field reads as null (unlinked) — never throws on the missing field. */
+function loadStoredRecord() {
   try {
     const raw = localStorage.getItem(STORAGE_KEY);
-    if (!raw) return [];
+    if (!raw) return null;
     const data = JSON.parse(raw);
-    if (!data || data.v !== STORAGE_VERSION || !Array.isArray(data.messages)) return [];
+    if (!data || data.v !== STORAGE_VERSION || !Array.isArray(data.messages)) return null;
+    const chatId =
+      typeof data.chatId === "string" && data.chatId.length ? data.chatId : null;
     // Legacy/corrupt shape → clean start; keep only well-formed raw-text
     // messages (nothing HTML-shaped can survive this filter).
-    return data.messages.filter(
+    return {
-      (m) =>
+      chatId,
-        m &&
+      messages: data.messages.filter(
-        (m.who === "user" || m.who === "brain") &&
+        (m) =>
-        typeof m.text === "string" &&
+          m &&
-        m.text.length > 0
+          (m.who === "user" || m.who === "brain") &&
-    );
+          typeof m.text === "string" &&
+          m.text.length > 0
+      ),
+    };
   } catch {
-    return []; // unreadable storage: start clean, never throw
+    return null; // unreadable storage: start clean, never throw
   }
 }
 
@@ -988,7 +1021,7 @@ function trimToBudget(messages) {
   for (;;) {
     let size = Infinity;
     try {
-      size = JSON.stringify({ v: STORAGE_VERSION, messages: out }).length;
+      size = JSON.stringify({ v: STORAGE_VERSION, chatId: null, messages: out }).length;
     } catch {
       break; // even one message cannot serialize — keep it in memory only
     }
@@ -1002,7 +1035,14 @@ function saveConversation() {
   try {
     localStorage.setItem(
       STORAGE_KEY,
-      JSON.stringify({ v: STORAGE_VERSION, messages: trimToBudget(conversation) })
+      JSON.stringify({
+        v: STORAGE_VERSION,
+        // Phase 55 (A2): the row link is persisted with the record (null
+        // = unlinked) — a reload restores it, so the next save point
+        // updates the SAME row instead of spawning a duplicate.
+        chatId: currentChatId,
+        messages: trimToBudget(conversation),
+      })
     );
   } catch {
     /* quota/private mode: chat keeps working with in-memory state only */
@@ -1057,20 +1097,28 @@ function renderStoredMessage(m) {
 
 /* On load: re-render the stored conversation (markdown, source chips,
    deflected styling, maybe-try chips). addMessage hides the empty state,
-   so a restored conversation starts right where it was left. */
+   so a restored conversation starts right where it was left. Phase 55
+   (A2): the row link is hydrated from the record here, at boot — before
+   any save point can run — so the next message updates the SAME row
+   (a pre-55 record restores unlinked, exactly as phase 14 did). */
 function restoreConversation() {
-  conversation = loadStoredConversation();
+  const record = loadStoredRecord();
+  conversation = record ? record.messages : [];
+  currentChatId = record ? record.chatId : null; // phase 55: the link survives reloads
   for (const m of conversation) renderStoredMessage(m);
   markLastRetryable(); // phase 49: the restored last brain bubble is retryable
 }
 
-/* ---------- save & load saved chats (phase 50, owner-locked 2026-08-29) ----------
+/* ---------- saved-chats row link (phase 50; auto-saved since phase 55) ----------
  *
  * `currentChatId` links the local conversation to a saved_chats row:
- * set to the created row's id on a fresh Save, set to the opened id on a
+ * set to the created row's id on a fresh auto-save (persistConversation
- * successful /?chat=<id> boot load, cleared by "New chat" and by the
+ * — the first save point after "New chat"), set to the opened id on a
- * 404-PUT fallback (the row vanished — recreate, never lose the save).
+ * successful /?chat=<id> boot load, hydrated from the bor.chat.v1
- * null = unlinked (a plain local session, phase 14).
+ * record on the local restore (phase 55 — the link survives reloads),
+ * and cleared by "New chat" and by the 404-PUT fallback (the row
+ * vanished — recreate, never lose the save). null = unlinked (a plain
+ * local session, phase 14).
  */
 let currentChatId = null; // string | null — the linked saved_chats row id
 
@@ -1113,7 +1161,7 @@ async function restoreSavedChatFromUrl() {
     return unavailable(); // malformed body — treat as unavailable
   }
   // The API schema guarantees the record shape; the same defensive filter
-  // as loadStoredConversation keeps a corrupted stored row from poisoning
+  // as loadStoredRecord keeps a corrupted stored row from poisoning
   // the restore (nothing HTML-shaped, ever).
   const messages = (Array.isArray(data?.messages) ? data.messages : []).filter(
     (m) =>
@@ -1147,24 +1195,38 @@ async function restoreSavedChatFromUrl() {
   return true;
 }
 
-/* Save the current conversation — the #save-chat-btn handler (phase 50).
+/* Auto-save the current conversation (phase 55, owner-locked A2) — the
- * No-op with a live-region line when there is nothing to save. Upsert:
+ * headless replacement of the phase-50 #save-chat-btn handler (the Save
- * linked → PUT /api/chats/<id> (re-Save updates the same row; no title in
+ * pill is gone: no button to press, no UI to update). Called fire-and-
- * the body, so the row keeps its current one); unlinked → POST /api/chats
+ * forget from the persistence save points (the user message on send,
- * (the server auto-titles) and link to the created id. A 404 from the PUT
+ * every brain-done through rememberBrainTurn, the pagehide partial —
- * — the row was deleted on the History page — unlinks and retries as a
+ * which rides rememberBrainTurn, so no extra wiring). The phase-50
- * create, then announces the outcome: the owner is never left with an
+ * upsert semantics, unchanged:
- * unsaved conversation because of a stale link. 403/5xx/network → the
+ *
- * error banner with an actionable line (the conversation is intact
+ *   • empty conversation → no-op (nothing to save, nothing to say);
- * locally either way). Success is status text only — the #send-status
+ *   • linked (currentChatId set) → PUT /api/chats/<id> — the SAME row
- * live region, never stale (PLAN §7.4); no banner. */
+ *     updates (no title in the body, so the row keeps its current one);
-async function saveCurrentChat() {
+ *     a 404 from the PUT — the row was deleted on the History page —
-  if (!conversation.length) {
+ *     unlinks and retries as a create, so a stale link can never wedge
-    sendStatus.textContent = "Nothing to save yet.";
+ *     the conversation;
-    return;
+ *   • unlinked → POST /api/chats (the server auto-titles) and link to
-  }
+ *     the created id (201) — the first save point creates the row.
-  if (saveBtn.disabled) return; // one save at a time (double-click guard)
+ *
-  saveBtn.disabled = true;
+ * The `persisting` flag is the double-fire guard: the save points can
+ * overlap (pagehide during a stream), so a call while an upsert is in
+ * flight is a no-op — the next save point retries. The A2 quiet contract
+ * on failure (non-ok HTTP or network): a one-line #send-status note,
+ * NO error banner, the turn never blocks. Success is SILENT (the History
+ * page is the visible proof — the toast is reserved for share), apart
+ * from clearing the phase-53 stale banner (a successful re-save
+ * re-stamps the row to the current generation — the row is no longer
+ * stale). */
+let persisting = false; // phase 55: one upsert at a time (double-fire guard)
+
+async function persistConversation() {
+  if (!conversation.length) return; // nothing to save
+  if (persisting) return; // an upsert is already in flight (double-fire guard)
+  persisting = true;
   const body = JSON.stringify({ messages: conversation });
   const headers = { "Content-Type": "application/json" };
   try {
@@ -1181,23 +1243,27 @@ async function saveCurrentChat() {
       res = await fetch("/api/chats", { method: "POST", headers, body });
     }
     if (!res.ok) {
-      showErrorBanner(
+      // A2 quiet contract: a failed auto-save never blocks the
-        "Couldn't save the conversation — check you're still signed in and try again."
+      // conversation — one status-line note, no error banner, and the
-      );
+      // next save point retries.
+      sendStatus.textContent =
+        "Couldn't save automatically — will try on the next message.";
       return;
     }
     if (res.status === 201) {
       const created = await res.json();
-      currentChatId = String(created.id); // fresh Save: link to the new row
+      currentChatId = String(created.id); // first save: link to the new row
     }
-    sendStatus.textContent = "Conversation saved.";
+    // Silent on success (A2) — but a re-save re-stamps the row to the
-    // Phase 53: a re-Save re-stamps the row to the current generation
+    // current generation (phase 53, task 03): the row is no longer
-    // (task 03) — the row is no longer stale, so the banner is done.
+    // stale, so the banner is done.
     if (staleBanner) staleBanner.hidden = true;
   } catch {
-    showErrorBanner("Couldn't save the conversation — is the app reachable?");
+    // A2 quiet contract: a network failure is the same one-line note.
+    sendStatus.textContent =
+      "Couldn't save automatically — will try on the next message.";
   } finally {
-    saveBtn.disabled = false; // released on EVERY outcome — never stale
+    persisting = false; // released on EVERY outcome
   }
 }
 
@@ -1250,6 +1316,41 @@ async function copyShareLinkWithFallback(absoluteUrl) {
   }
 }
 
+/* Share-success toast (phase 55, task 04 — TODO.md L5): the VISIBLE
+ * confirmation that a share worked. A4 owner-locked: the node is
+ * aria-hidden (visual only) — the #send-status live region remains the
+ * a11y announcer, so there is no double screen-reader read. Top-right,
+ * slides down, auto-dismisses in ~4s. A SINGLE instance: the node is
+ * lazy-created ONCE and reused — a new toast replaces a pending one
+ * (clear the prior dismiss timer, re-run the entry) and toasts never
+ * stack. The text lands via textContent only (XSS-safe). Shown on
+ * BOTH share-success paths; NEVER on a failure (the error
+ * banner is the failure UI). Page-script-local by design — the toast
+ * is chat-page only for this phase (no cross-page module). */
+let toastEl = null; // the single toast node — lazy-created, reused
+let toastTimer = 0; // the pending auto-dismiss (replaced by a new toast)
+
+function showToast(message) {
+  if (!toastEl) {
+    toastEl = document.createElement("div");
+    toastEl.className = "toast";
+    toastEl.setAttribute("aria-hidden", "true"); // A4: visual only — #send-status is the announcer
+    document.body.appendChild(toastEl);
+  }
+  toastEl.textContent = message; // XSS-safe text assignment
+  // Re-trigger the entry even when a toast is already up (a second
+  // share while the first is showing): clear the pending dismiss,
+  // drop the visible state, force a reflow (restarts the CSS
+  // transition), then show again.
+  clearTimeout(toastTimer);
+  toastEl.classList.remove("is-visible");
+  void toastEl.offsetWidth; // force reflow — the entry transition restarts
+  toastEl.classList.add("is-visible");
+  toastTimer = setTimeout(() => {
+    toastEl.classList.remove("is-visible"); // auto-dismiss ~4s
+  }, 4000);
+}
+
 /* Share the current conversation — the #share-chat-btn handler
  * (phase 51, owner-locked 2026-08-29, TODO.md L6). No-op with a live-
  * region line when there is nothing to share (the same guard as
@@ -1259,7 +1360,11 @@ async function copyShareLinkWithFallback(absoluteUrl) {
  * action saves AND shares (owner-locked). Success copies the absolute
  * URL (clipboard → inline-field fallback); the live region reads
  * "Share link copied." or "Share link ready — copy it from the
- * field." 403/5xx → the actionable banner (signed-out hint); a network
+ * field." Phase 55 task 04: BOTH success paths additionally raise the
+ * visual-only toast (showToast — aria-hidden; the #send-status line
+ * stays the a11y announcer; a failed share NEVER toasts — the error
+ * banner is the failure UI). 403/5xx → the actionable banner
+ * (neutral — the write surface is public, phase 55 task 01); a network
  * failure → the reachable? banner. The double-click guard releases in
  * the finally — never stale (PLAN §7.4). */
 async function shareCurrentChat() {
@@ -1276,9 +1381,7 @@ async function shareCurrentChat() {
       // token comes back unchanged, a new one is minted.
       const res = await fetch(`/api/chats/${currentChatId}/share`, { method: "POST" });
       if (!res.ok) {
-        showErrorBanner(
+        showErrorBanner("Couldn't share the conversation — try again.");
-          "Couldn't share the conversation — check you're still signed in and try again."
-        );
         return;
       }
       shareUrl = (await res.json()).share_url;
@@ -1291,9 +1394,7 @@ async function shareCurrentChat() {
         body: JSON.stringify({ messages: conversation, share: true }),
       });
       if (!res.ok) {
-        showErrorBanner(
+        showErrorBanner("Couldn't share the conversation — try again.");
-          "Couldn't share the conversation — check you're still signed in and try again."
-        );
         return;
       }
       const created = await res.json();
@@ -1301,9 +1402,19 @@ async function shareCurrentChat() {
       shareUrl = created.share_url;
     }
     const copied = await copyShareLinkWithFallback(absoluteShareUrl(shareUrl));
+    // The #send-status lines stay the a11y announcer (PLAN §7.4 never-
+    // stale) — the toast below is visual only (aria-hidden, task 04).
     sendStatus.textContent = copied
       ? "Share link copied."
       : "Share link ready — copy it from the field.";
+    // Task 04 (A4): the VISIBLE confirmation rides the same two
+    // success paths, each with its own text. A failed share never
+    // toasts — the error banner is the failure UI.
+    if (copied) {
+      showToast("Share link copied.");
+    } else {
+      showToast("Share link ready — copy it from the field.");
+    }
   } catch {
     showErrorBanner("Couldn't share the conversation — is the app reachable?");
   } finally {
@@ -1319,11 +1430,12 @@ async function shareCurrentChat() {
  * lastBrainWrap, no preceding user record — make a stale or superseded
  * click a no-op that resolves nothing). The handler AWAITs the returned
  * turn promise, and only when the turn completed WITHOUT the error
- * banner persists the linked row through the SAME upsert as Save:
+ * banner persists the linked row through the SAME upsert as the
+ * auto-save:
  * PUT /api/chats/<id> (the server re-stamps sources_version → the row
  * is fresh again); a 404 (the row was deleted from History meanwhile)
- * follows saveCurrentChat's stale-link rule — unlink + recreate, so the
+ * follows persistConversation's stale-link rule — unlink + recreate,
- * owner is never left with an unsaved conversation. A regenerate that
+ * so the owner is never left with an unsaved conversation. A regenerate that
  * errors mid-stream leaves the row untouched (stale stays true —
  * Regenerate stays available); a regenerate STOPPED mid-stream (phase
  * 48) persists the stopped partial (the owner engaged with the new
@@ -1388,6 +1500,10 @@ async function regenerateStaleChat() {
 function rememberBrainTurn(rawText, meta) {
   conversation.push({ who: "brain", text: rawText || "…", ...meta });
   saveConversation();
+  // Phase 55 (A2): the auto-save rides the brain save point — the row
+  // updates with the new brain turn + metadata. The pagehide partial
+  // reuses this helper, so it rides the same path (no extra wiring).
+  persistConversation();
 }
 
 /* ---------- new chat (phase 14) ----------
@@ -1430,7 +1546,7 @@ function applyAuthState() {
 function startNewChat() {
   if (uiState === UI_STATE.thinking || uiState === UI_STATE.streaming) return;
   conversation = [];
-  currentChatId = null; // phase 50: a new conversation is unlinked until saved
+  currentChatId = null; // phase 55: unlinked — a fresh row on its first message
   if (staleBanner) staleBanner.hidden = true; // phase 53: the banner described the cleared conversation
   clearStoredConversation();
   removeTyping();
@@ -1564,6 +1680,10 @@ async function runTurn(text, { reask = false } = {}) {
     // sent, so a failed/interrupted turn never loses it.
     conversation.push({ who: "user", text });
     saveConversation();
+    // Phase 55 (A2): the auto-save rides the save point — an unlinked
+    // conversation creates its row here (auto-title, server-side), a
+    // linked one refreshes. Fire-and-forget: it never blocks the turn.
+    persistConversation();
   }
 
   let wrap = null;
@@ -1797,14 +1917,14 @@ input.addEventListener("keydown", (e) => {
 });
 composer.addEventListener("submit", handleSend);
 
-/* Phase 50 (owner-locked 2026-08-29, TODO.md L5): the Save pill stores
+/* Phase 55 (owner-locked A2, 2026-08-31): the phase-50 Save binding is
- * the current conversation in Postgres (the upsert semantics live in
+ * GONE with the pill — there is no Save control; persistConversation()
- * saveCurrentChat). The button ships hidden in index.html; the boot
+ * auto-saves headless at the save points (fire-and-forget, quiet on
- * IIFE below reveals it for admin (absent-not-hidden for anonymous,
+ * failure, silent on success).
- * phase 16). Status-only feedback — the live region, never stale. */
+ * Phase 51 (owner-locked 2026-08-29, TODO.md L6; visible to every
-saveBtn?.addEventListener("click", saveCurrentChat);
+ * visitor since phase 55 task 03): the Share pill is static,
-/* Phase 51 (owner-locked 2026-08-29, TODO.md L6): the Share pill —
+ * always-visible markup (no reveal step) — only the click binding
- * same ship-hidden/reveal contract as Save (the boot IIFE below). */
+ * lives here. */
 shareBtn?.addEventListener("click", shareCurrentChat);
 /* Phase 53 (task 05): the stale banner's Regenerate pill. The binding
  * is inert unless the banner is revealed — which only happens on the
@@ -1839,15 +1959,18 @@ window.addEventListener("pagehide", () => {
    nav link; applyAuthState() then applies the chat-page-only gating.
    Phase 34: the steering panel's admin boot refresh (count badge) and
    the anonymous removal of the tuning surface both happen inside
-   initSharedHeader() now. */
+   initSharedHeader() now. Phase 55 (A2): the local restore hydrates
+   currentChatId from the record (restoreConversation), so the row link
+   survives a plain reload — no Save pill to reveal anymore. */
 (async () => {
   await initSharedHeader(); // header.js: whoami + Sign in/out + steering gate
   isAdmin = await fetchIsAdmin(); // the same cached promise — one whoami
   applyAuthState(); // chat page: the auth pair (idempotent with header.js)
-  if (saveBtn) saveBtn.hidden = !isAdmin; // phase 50: absent-not-hidden (phase 16)
+  // Phase 55 (task 03): no Share-reveal step — the pill is static,
-  if (shareBtn) shareBtn.hidden = !isAdmin; // phase 51: the Share pill joins the same block
+  // always-visible markup (visible to every visitor, phase 51 contract).
   // Phase 50: /?chat=<id> (valid uuid + admin) boots into the saved
-  // conversation; every other outcome falls through to the local restore.
+  // conversation; every other outcome falls through to the local restore
+  // (which hydrates the row link from the record — phase 55).
   const openedSaved = await restoreSavedChatFromUrl();
   if (!openedSaved) restoreConversation();
   loadSuggestions();

frontend/assets/styles.css

@@ -308,44 +308,18 @@ html::after {
    whole control below 640px. */
 .new-chat-btn svg { width: 16px; height: 16px; display: none; }
 
-/* Phase 50 (owner-locked 2026-08-29, TODO.md L5): the "Save" pill — the
+/* Phase 55 (owner-locked A2, 2026-08-31): the phase-50 Save-pill rules
-   EXACT visual family of .new-chat-btn (same declarations, so the two
+   are GONE with the pill — every conversation auto-saves (app.js);
-   chat-shell actions always read as a pair): solid brand pill, --bg text
+   the chat-shell actions are New chat + Share only.
-   on --brand (5.2:1, WCAG AA), borderless, ≥44px target, hover lightens
-   the brand fill, focus-visible via the global 3px rule. Shipped hidden
-   in index.html — app.js reveals it for admin only (phase 16
-   absent-not-hidden); ≤640px overrides below mirror the New chat ones
-   (label stays visible in .chat-shell, icon hidden). */
-.save-chat-btn {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  gap: 0.4rem;
-  min-height: 44px;
-  padding: 0.5rem 0.9rem;
-  border-radius: 999px;
-  border: 0;
-  background: var(--brand);
-  color: var(--bg);
-  font: inherit;
-  font-weight: 700;
-  font-size: 0.95rem;
-  white-space: nowrap;
-  cursor: pointer;
-}
-.save-chat-btn:hover { background: #f55a72; color: var(--bg); }
-/* The save mark is hidden on desktop (the label carries the pill); it is
-   the whole control below 640px (mirrored in the ≤640 block below). */
-.save-chat-btn svg { width: 16px; height: 16px; display: none; }
 
-/* Phase 51 (owner-locked 2026-08-29, TODO.md L6): the "Share" pill —
+   Phase 51 (owner-locked 2026-08-29, TODO.md L6): the "Share" pill —
-   the EXACT visual family of .save-chat-btn (same declarations, so the
+   the EXACT visual family of .new-chat-btn (same declarations, so the
    chat-shell actions always read as a pair): solid brand pill, --bg
    text on --brand (5.2:1, WCAG AA), borderless, ≥44px target, hover
    lightens the brand fill, focus-visible via the global 3px rule.
    Shipped hidden in index.html — app.js reveals it for admin only
-   (phase 16 absent-not-hidden); ≤640px overrides below mirror the
+   (phase 16 absent-not-hidden); ≤640px overrides below mirror the New
-   Save ones (label stays visible in .chat-shell, icon hidden there). */
+   chat ones (label stays visible in .chat-shell, icon hidden there). */
 .share-chat-btn {
   display: inline-flex;
   align-items: center;
@@ -430,6 +404,24 @@ html::after {
   flex: 1;
 }
 
+/* Phase 55 (task 05, 2026-08-31, TODO.md L6, owner-locked A5): the
+   chat-actions row — New chat + Share share ONE .chat-actions element
+   (a normal .chat-shell column child). As a flex ITEM of the column it
+   spans the column width, but as a flex ROW with align-items: center
+   (not the column default stretch) each pill keeps its INTRINSIC
+   content width — two pills side by side, left-aligned in the column,
+   on desktop. The ≤640px block flips this to a vertical stack
+   (flex-direction: column + align-items: stretch — full-width pills,
+   New chat above Share; the existing ≤640px pill rules apply to the
+   stacked pills unchanged). The 46rem column contract is untouched
+   (PLAN §7). */
+.chat-actions {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  gap: 0.6rem;
+}
+
 /* Phase 52 (owner revision 2026-08-30): `flex-grow` is the other half of
    the pin. `position: sticky` only ever pulls a box UP toward the
    viewport bottom — it can never push a box DOWN to meet it — so on an
@@ -1304,6 +1296,49 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
 .stale-regenerate:disabled { opacity: 0.6; cursor: wait; }
 .stale-regenerate svg { width: 16px; height: 16px; display: block; }
 
+/* Phase 55 (task 04): the share-success toast (TODO.md L5). Top-right,
+   just under the sticky header (--header-h + a small offset — the
+   variable already steps 64px → 58px at ≤640px), z-index 1000 (the
+   modal overlay contract — above the header's 20 and the skip-link's
+   100). VISUAL ONLY (A4 owner-locked): the node ships aria-hidden
+   from app.js — #send-status stays the a11y announcer (no double
+   screen-reader read). Solid brand fill: --bg text on --brand = 5.2:1
+   (AA — the .new-chat-btn family); rounded, shadowed, one line of
+   text that wraps under the small max-width. Hidden by default
+   (opacity 0 + pointer-events: none — it never intercepts clicks when
+   idle); .toast.is-visible (toggled by showToast) runs the entry:
+   slide-down + fade (translateY(-8px) → 0, 200ms). */
+.toast {
+  position: fixed;
+  top: calc(var(--header-h) + 0.75rem);
+  right: 1rem;
+  z-index: 1000;
+  max-width: min(22rem, calc(100vw - 2rem));
+  padding: 0.6rem 1rem;
+  border-radius: var(--radius-sm);
+  background: var(--brand);
+  color: var(--bg);
+  font-size: 0.92rem;
+  font-weight: 600;
+  box-shadow: var(--shadow);
+  opacity: 0;
+  pointer-events: none;
+  transform: translateY(-8px);
+  transition: opacity 200ms ease, transform 200ms ease;
+}
+.toast.is-visible {
+  opacity: 1;
+  transform: translateY(0);
+}
+@media (prefers-reduced-motion: reduce) {
+  /* No slide: BOTH states rest at transform: none (the .is-visible
+     rule would otherwise out-specify the bare .toast); the opacity
+     fade remains (120ms). */
+  .toast,
+  .toast.is-visible { transform: none; }
+  .toast { transition: opacity 120ms ease; }
+}
+
 /* ---------- Login page (phase 16) ---------- */
 /* Centered card in the standard frame: one admin, one password. */
 .login-shell {
@@ -2586,7 +2621,7 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
      designated clip target, pills squeeze next). */
   .nav-link { padding: 0.4rem 0.5rem; font-size: 0.85rem; }
   .app-nav { gap: 0.15rem; }
-  .new-chat-btn, .save-chat-btn, .auth-link { padding: 0.45rem 0.5rem; }
+  .new-chat-btn, .auth-link { padding: 0.45rem 0.5rem; }
 }
 
 /* ---------- Responsive (mobile-first adjustments) ---------- */
@@ -2689,13 +2724,8 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
   .new-chat-btn { padding: 0.4rem 0.3rem; }
   .new-chat-label { display: none; }
   .new-chat-btn svg { display: block; }
-  /* Phase 50: the Save pill squeezes with New chat (same family, same
+  /* Phase 51: the Share pill squeezes with New chat (same family, same
-     rules — the chat-shell overrides below keep both labels visible). */
+     rules — the chat-shell override below keeps the label visible). */
-  .save-chat-btn { padding: 0.4rem 0.3rem; }
-  .save-chat-label { display: none; }
-  .save-chat-btn svg { display: block; }
-  /* Phase 51: the Share pill squeezes with Save (same family, same
-     rules — the chat-shell overrides below keep both labels visible). */
   .share-chat-btn { padding: 0.4rem 0.3rem; }
   .share-chat-label { display: none; }
   .share-chat-btn svg { display: block; }
@@ -2703,10 +2733,14 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
      hide the icon (the button lives inside .chat-shell, not the navbar). */
   .chat-shell .new-chat-label { display: inline; }
   .chat-shell .new-chat-btn svg { display: none; }
-  .chat-shell .save-chat-label { display: inline; }
-  .chat-shell .save-chat-btn svg { display: none; }
   .chat-shell .share-chat-label { display: inline; }
   .chat-shell .share-chat-btn svg { display: none; }
+  /* Phase 55 (task 05, TODO.md L6, A5): the action row flips to a
+     vertical stack at the phone breakpoint — full-width pills, New
+     chat above Share. The pill rules above (padding, the
+     icon/label handling, the .chat-shell label overrides) apply to
+     the stacked pills unchanged. */
+  .chat-actions { flex-direction: column; align-items: stretch; gap: 0.5rem; }
   /* Phase 53: the stale banner's row wraps at phone width (message
      above, action below) — the pill takes a full-width comfortable
      row instead of squeezing into the text. */

frontend/index.html

@@ -128,57 +128,62 @@
       </section>
       <p class="visually-hidden" id="steering-announcer" role="status" aria-live="polite" aria-atomic="true"></p>
 
-      <!-- Phase 14 (module-owned since phase 34 task 02): "New chat" resets
+      <!-- Phase 55 (task 05, 2026-08-31, TODO.md L6, owner-locked A5):
-           the local (localStorage) conversation and clears the rendered list.
+           the chat-actions row — New chat + Share share ONE
-           The binding lives in header.js — dispatches "bor:new-chat" which
+           .chat-actions wrapper (a normal .chat-shell column child,
-           app.js acts on (it owns the in-flight-turn guard + list reset). -->
+           replacing the two pills as its direct children): a
-      <button type="button" class="new-chat-btn" id="new-chat-btn" aria-label="New chat">
+           HORIZONTAL row on desktop (side by side, left-aligned, each
-        <svg aria-hidden="true" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"><path d="M12 5v14M5 12h14"/></svg>
+           pill at its intrinsic width — the row's align-items: center
-        <span class="new-chat-label">New chat</span>
+           beats the column's stretch) and a VERTICAL stack at the
-      </button>
+           existing ≤640px breakpoint (New chat above Share,
+           full-width). DOM order New chat → Share in both
+           orientations; the 46rem column contract is untouched
+           (PLAN §7). The kb-banner / stale-banner / steering / 
+           announcer structure around the row is unchanged.
 
-      <!-- Phase 50 (owner-locked 2026-08-29, `TODO.md` L5): "Save" stores
+           Phase 14 (module-owned since phase 34 task 02): "New chat"
-           the current conversation in Postgres (saved_chats) — admin-only.
+           resets the local (localStorage) conversation and clears the
-           SHIPS HIDDEN: app.js reveals it only when whoami says admin
+           rendered list. The binding lives in header.js — dispatches
-           (phase 16 absent-not-hidden — `hidden` is display:none, so
+           "bor:new-chat" which app.js acts on (it owns the
-           anonymous visitors see no trace). Handler in app.js, upsert +
+           in-flight-turn guard + list reset). -->
-           ?chat=<id> contract: an unlinked Save POSTs /api/chats (the
+      <div class="chat-actions">
-           server auto-titles from the first question, 120-char cap) and
+        <button type="button" class="new-chat-btn" id="new-chat-btn" aria-label="New chat">
-           links the conversation to the created row's id; a re-Save PUTs
+          <svg aria-hidden="true" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"><path d="M12 5v14M5 12h14"/></svg>
-           the SAME row (the same conversation never spawns a second row);
+          <span class="new-chat-label">New chat</span>
-           a 404 PUT unlinks and recreates; "New chat" unlinks. Booting at
+        </button>
-           /?chat=<id> (valid uuid, admin) GETs the row and renders its
-           messages through the SAME restore path as the phase-14 local
-           session (pixel-identical), links the conversation, and mirrors
-           it to localStorage — a later Save updates that row. A deleted /
-           unknown id degrades to the normal local restore with a banner. -->
-      <button type="button" class="save-chat-btn" id="save-chat-btn" aria-label="Save chat" hidden>
-        <svg aria-hidden="true" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round"><path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2Z"/><path d="M17 21v-8H7v8"/><path d="M7 3v5h8"/></svg>
-        <span class="save-chat-label">Save</span>
-      </button>
 
-      <!-- Phase 51 (owner-locked 2026-08-29, `TODO.md` L6): "Share"
+      <!-- Phase 55 (owner-locked A2, 2026-08-31): there is NO Save
+           control — every conversation auto-saves itself (app.js
+           persistConversation at the phase-14/20 save points). The
+           History page is the visible proof; a failed auto-save leaves
+           only a one-line status note (never a button, never a banner).
+
+           Phase 55 (owner-locked A1, 2026-08-31): the "Share" pill is
+           STATIC, ALWAYS-VISIBLE markup — there is no reveal step
+           (phase 51's admin-only ship-hidden gate is gone with it; task
+           01 opened the save/share write surface to every visitor).
+
+           Phase 51 (owner-locked 2026-08-29, `TODO.md` L6): "Share"
            turns the current conversation into a PUBLIC read-only link —
            /shared/<token> (a 128-bit uuid4 on the saved_chats row,
-           migration 0009; the anonymous page is task 03). The
+           migration 0009). The save-then-share contract: an UNSAVED
-           save-then-share contract: an UNSAVED (unlinked) conversation
+           (unlinked) conversation is saved AND shared in ONE action —
-           is saved AND shared in ONE action — app.js POSTs /api/chats
+           app.js POSTs /api/chats with { messages, share: true } (the
-           with { messages, share: true } (the server sets the token in
+           server sets the token in the same commit) and links the
-           the same commit) and links the conversation to the created
+           conversation to the created row; a saved (linked) one just
-           row; a saved (linked) one just POSTs /api/chats/<id>/share
+           POSTs /api/chats/<id>/share (idempotent — the existing token
-           (idempotent — the existing token comes back unchanged). On
+           comes back unchanged). On success the ABSOLUTE link is
-           success the ABSOLUTE link is copied to the clipboard; a
+           copied to the clipboard; a non-secure (http) homelab origin
-           non-secure (http) homelab origin that rejects the clipboard
+           that rejects the clipboard gets the inline link-field
-           gets the inline link-field fallback instead (owner-locked —
+           fallback instead (owner-locked — app.js renders
-           app.js renders .share-link-fallback near the status line).
+           .share-link-fallback near the status line). app.js binds the
-           Admin-only — ships HIDDEN exactly like Save (absent-not-
+           click to shareCurrentChat. Unsharing lives on the History
-           hidden, phase 16); app.js reveals it at boot (the same
+           page's Share column (admin-only). -->
-           admin-reveal block) and binds the click to shareCurrentChat.
+        <button type="button" class="share-chat-btn" id="share-chat-btn" aria-label="Share chat">
-           Unsharing lives on the History page's Share column (task 04). -->
+          <svg aria-hidden="true" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/></svg>
-      <button type="button" class="share-chat-btn" id="share-chat-btn" aria-label="Share chat" hidden>
+          <span class="share-chat-label">Share</span>
-        <svg aria-hidden="true" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/></svg>
+        </button>
-        <span class="share-chat-label">Share</span>
+      </div>
-      </button>
 
       <!-- Phase 49 (2026-08-29, TODO.md L4): the meta row under a brain
            bubble can carry JS-injected actions (app.js) — Tune (admin

tests/e2e/test_chat_history.py

@@ -6,13 +6,17 @@ Run in isolation (DB must be up: ``podman compose up -d db``):
 
     uv run pytest tests/e2e/test_chat_history.py -v --no-cov
 
-The owner-locked loop under test (A10 extension, 2026-08-29):
+The owner-locked loop under test (A10 extension, 2026-08-29; phase 55
+replaced the Save pill with auto-save — the tests below wait for the
+auto-saved row via the admin list, since auto-saves are SILENT, A2):
 
-* **Save** — on the chat page, admin-only (the pill ships hidden and
+* **Auto-save** — on the chat page, no control (the pill is GONE,
-  whoami reveals it): the current conversation POSTs to ``/api/chats``
+  phase 55): the current conversation upserts itself at the save
-  (auto-title = the first question, whitespace-collapsed, 120-char cap)
+  points — create on the first user message (auto-title = the first
-  and links to the created row; a re-Save PUTs the SAME row (upsert);
+  question, whitespace-collapsed, 120-char cap) and update on each
-  "New chat" unlinks, so the next Save creates again;
+  brain-done; the SAME row updates (upsert — the conversation never
+  spawns a second row, the link survives reloads); "New chat" unlinks,
+  so the next conversation creates a fresh row;
 * **History** — ``/history.html`` lists the saved chats in a full-width
   table (Title | Messages | Updated | Actions); the Title cell IS the
   Open link (``/?chat=<id>`` — "return to that history with a click"),
@@ -24,9 +28,12 @@ The owner-locked loop under test (A10 extension, 2026-08-29):
   session (pixel-identical), links it, and a subsequent Save updates
   that row; a deleted/unknown id degrades to the local restore with the
   error banner;
-* **Anonymous** — no Save button, no History nav link, the History page
+* **Anonymous** — no Save control (the element is absent from the DOM
-  shows the gated state WITHOUT ever fetching ``/api/chats`` (the router
+  at every width — phase 55), but the Share pill IS visible (phase 55
-  403s them — pinned via the request log), and the API 403s.
+  task 03 — the write surface is public, the pill is static markup),
+  no History nav link, the History page shows the gated state WITHOUT
+  ever fetching ``/api/chats`` (the router 403s them — pinned via the
+  request log), and the API 403s.
 
 DB isolation: the shared e2e Postgres keeps ``saved_chats`` rows across
 suites, so every test here uses a DISTINCTIVE question text (its
@@ -38,6 +45,7 @@ embeddings); ``saved_chats`` is never touched by the reset.
 from __future__ import annotations
 
 import asyncio
+import time
 from pathlib import Path
 from threading import Thread
 from typing import Any
@@ -144,15 +152,30 @@ def _delete_chat(app_url: str, cookies: dict[str, str], chat_id: str) -> None:
     httpx.delete(f"{app_url}/api/chats/{chat_id}", timeout=10, cookies=cookies)
 
 
-def _save(page: Page) -> None:
+def _wait_saved_row(
-    """Press Save and wait for the live-region confirmation (the
+    app_url: str,
-    never-stale contract: the status line is the success feedback)."""
+    cookies: dict[str, str],
-    page.locator("#save-chat-btn").click()
+    title: str,
-    expect(page.locator("#send-status")).to_have_text("Conversation saved.")
+    messages: int = 2,
+) -> dict[str, Any]:
+    """Wait for the auto-saved row (phase 55: auto-saves are SILENT —
+    A2 — so there is no status line to wait on). The upsert is
+    fire-and-forget from the UI's point of view, so poll the admin
+    list until the row with the conversation's auto-title appears with
+    the expected message count."""
+    deadline = time.monotonic() + 15
+    last: dict[str, Any] | None = None
+    while time.monotonic() < deadline:
+        last = _find_row(_chats(app_url, cookies), title)
+        if last is not None and last["message_count"] >= messages:
+            return last
+        time.sleep(0.2)
+    raise AssertionError(f"no auto-saved row for {title!r} (last: {last!r})")
 
 
 # ---------------------------------------------------------------------------
-# 1. Save on the chat page → the row exists (UI + API agree)
+# 1. Auto-save on the chat page (no Save control) → the row exists
+#    (API is the proof — auto-saves are silent, A2)
 # ---------------------------------------------------------------------------
 
 
@@ -168,21 +191,19 @@ def test_save_and_see_history(
     q = "How is my Kubernetes cluster set up? (hist-save)"
     _ask(page, q)
 
-    # Admin: the Save pill is revealed (ship-hidden, whoami reveals it).
+    # Phase 55: there is NO Save control — the conversation auto-saved
-    save = page.locator("#save-chat-btn")
+    # at the save points (create on the first question, update on the
-    expect(save).to_be_visible()
+    # brain-done). There is nothing to click and no status line to wait
-    expect(save).to_have_attribute("aria-label", "Save chat")
+    # on (A2 silent): the API is the proof.
-
+    # Also: the pill is gone from the DOM at every width.
-    save.click()
+    expect(page.locator("#save-chat-btn")).to_have_count(0)
-    expect(page.locator("#send-status")).to_have_text("Conversation saved.")
 
     cookies = _admin_cookies(page)
     created: str | None = None
     try:
         # The API agrees: the row exists, auto-titled from the first
         # question (whitespace-collapsed, <=120 chars), two messages.
-        row = _find_row(_chats(app_url, cookies), " ".join(q.split())[:120])
+        row = _wait_saved_row(app_url, cookies, " ".join(q.split())[:120])
-        assert row is not None, "the saved chat row must exist"
         assert row["message_count"] == 2
         created = row["id"]
 
@@ -221,10 +242,10 @@ def test_open_chat_returns_to_history(
     # The answer text the History session saw (rendered bubble).
     answer_before = page.locator(".msg.brain .bubble").first.inner_text()
 
-    _save(page)
+    # Phase 55: the conversation auto-saved (no Save pill) — wait for
+    # the row via the admin list.
     cookies = _admin_cookies(page)
-    row = _find_row(_chats(app_url, cookies), q)
+    row = _wait_saved_row(app_url, cookies, q)
-    assert row is not None
     chat_id = row["id"]
     try:
         # From the History page, the title IS the Open link…
@@ -267,12 +288,13 @@ def test_open_chat_returns_to_history(
         _ask(page, "How is my Kubernetes cluster set up? (hist-open-2)")
         expect(page.locator(".msg.user .bubble")).to_have_count(2)
 
-        # …and a re-Save UPSERTS: the same single row, count grown to 4.
+        # …and the next brain-done auto-save UPSERTS: the same single
-        _save(page)
+        # row, count grown to 4 (phase 55 — no Save pill).
+        row2 = _wait_saved_row(app_url, cookies, q, messages=4)
         mine = [c for c in _chats(app_url, cookies) if c["title"] == q]
-        assert len(mine) == 1, "the re-Save must not spawn a second row"
+        assert len(mine) == 1, "the auto-save must not spawn a second row"
-        assert mine[0]["id"] == chat_id, "the re-Save updates the SAME row"
+        assert mine[0]["id"] == chat_id, "the auto-save updates the SAME row"
-        assert mine[0]["message_count"] == 4
+        assert row2["message_count"] == 4
     finally:
         _delete_chat(app_url, cookies, chat_id)
 
@@ -294,12 +316,10 @@ def test_new_chat_unlinks(
 
     q1 = "How is my Kubernetes cluster set up? (hist-unlink)"
     _ask(page, q1)
-    _save(page)
     cookies = _admin_cookies(page)
     cleanup: list[str] = []
     try:
-        row1 = _find_row(_chats(app_url, cookies), q1)
+        row1 = _wait_saved_row(app_url, cookies, q1)  # auto-saved (phase 55)
-        assert row1 is not None
         cleanup.append(row1["id"])
 
         # New chat clears the conversation AND unlinks it from the row.
@@ -307,11 +327,12 @@ def test_new_chat_unlinks(
         expect(page.locator("#send-status")).to_contain_text("New chat started")
         expect(page.locator(".msg")).to_have_count(0)
 
-        # A fresh conversation, saved: a NEW row (a create, not the
+        # A fresh conversation, auto-saved (phase 55): a NEW row (a
-        # previous row's update) — the list now carries two of ours.
+        # create, not the previous row's update) — the list now carries
+        # two of ours.
         q2 = "How is my Kubernetes cluster set up? (hist-unlink-2)"
         _ask(page, q2)
-        _save(page)
+        _wait_saved_row(app_url, cookies, q2)  # wait for the fresh auto-save
         rows = _chats(app_url, cookies)
         mine = [c for c in rows if c["title"] in (q1, q2)]
         assert len(mine) == 2, "Save after New chat must create a second row"
@@ -343,10 +364,8 @@ def test_delete_two_step(
 
     q = "How is my Kubernetes cluster set up? (hist-delete)"
     _ask(page, q)
-    _save(page)
     cookies = _admin_cookies(page)
-    row = _find_row(_chats(app_url, cookies), q)
+    row = _wait_saved_row(app_url, cookies, q)  # auto-saved (phase 55)
-    assert row is not None
     chat_id = row["id"]
     try:
         page.goto(app_url + "/history.html")
@@ -396,7 +415,8 @@ def test_delete_two_step(
 
 
 # ---------------------------------------------------------------------------
-# 5. Anonymous: no Save button, no History nav link, the History page is
+# 5. Anonymous: no Save control (absent), the Share pill visible
+#    (phase 55 task 03), no History nav link, the History page is
 #    gated WITHOUT fetching /api/chats, and the API 403s
 # ---------------------------------------------------------------------------
 
@@ -414,9 +434,13 @@ def test_anonymous_cannot(
     page.goto(app_url + "/")
     # Settled anonymous state (the whoami round-trip has landed)…
     expect(page.locator("#sign-in-link")).to_be_visible(timeout=15_000)
-    # …and the phase-50 surface is absent for anonymous: no Save pill,
+    # …and the phase-50 surface is absent for anonymous: no Save control
-    # no History nav link (both ship hidden and stay hidden).
+    # (the element is GONE from the DOM — phase 55 — there is nothing
-    expect(page.locator("#save-chat-btn")).to_be_hidden()
+    # to hide) and no History nav link (ships hidden and stays hidden)
+    # — but the Share pill IS visible (phase 55 task 03: the write
+    # surface is public, the pill is static markup).
+    expect(page.locator("#save-chat-btn")).to_have_count(0)
+    expect(page.locator("#share-chat-btn")).to_be_visible()
     expect(page.locator("#nav-history")).to_be_hidden()
 
     # Direct visit to the History page: it loads and shows the gated

tests/e2e/test_save_share_ux.py

@@ -0,0 +1,562 @@
+"""Phase 55 E2E (Playwright): save by default + anonymous share + action-row layout.
+
+TODO.md L3–L6 (owner 2026-08-31, roadmap confirmation — the four items
+this suite verifies, in the browser):
+  L3 "Share chat should work anonymously without login"
+  L4 "Save shouldn't be a button, every chat should be saved by default"
+  L5 "Need feedback (probably dropdown notification toast) to show share worked"
+  L6 "New Chat and Share buttons should only be vertically stacked when in
+     mobile, otherwise they should be horizontally next to each other"
+
+Run in isolation (DB must be up: ``podman compose up -d db``):
+
+    uv run pytest tests/e2e/test_save_share_ux.py -v --no-cov
+
+The owner-locked loop under test (2026-08-31):
+
+* **Anonymous auto-save (L4 / A2)** — there is NO Save control in the
+  DOM at any width; a signed-out visitor's first question auto-upserts
+  EXACTLY ONE ``saved_chats`` row (the auto-title, both messages) —
+  verified through the admin's ``GET /api/chats`` (the management
+  surface stays admin-only, phase 55 task 01) with no button press
+  anywhere;
+* **No duplicate across reload (L4)** — a plain reload restores the
+  conversation from localStorage AND the row link (``chatId`` in the
+  ``bor.chat.v1`` record, task 02): a second question updates the SAME
+  row — the title's row count stays one, the message count grows
+  2 → 4;
+* **Anonymous share + toast (L3 / L5 / A4)** — the Share pill is
+  visible WITHOUT login; clicking it on a non-empty conversation mints
+  the public link (clipboard path, the inline field on non-secure
+  origins) and raises the top-right toast ("Share link copied.",
+  ``aria-hidden`` visual-only, a single instance, auto-dismiss ~4s); a
+  FRESH incognito context opens ``/shared/<token>`` read-only (title +
+  both bubbles, the phase-51 zero-controls surface); the admin's
+  History Unshare (inline two-step) revokes — the SAME URL then shows
+  the "invalid or revoked" state;
+* **Layout (L6 / A5)** — desktop 1280×800: ``#new-chat-btn`` and
+  ``#share-chat-btn`` share one horizontal row inside ``.chat-actions``
+  (overlapping y bands, Share's x beyond New chat's x + width, each
+  pill at intrinsic width — never the full 46rem column); mobile
+  390×844: stacked vertically (Share below New chat, full-width);
+  360px wide: no horizontal page overflow;
+* **Admin still works (A1 sanity)** — the same auto-save machinery
+  fires for a signed-in admin (the write surface is public either way;
+  the row lands in the admin's History).
+
+DB isolation: the shared e2e Postgres keeps ``saved_chats`` rows across
+suites, so every test uses a DISTINCTIVE question (its auto-title is
+therefore unique), selects rows by auto-title (never absolute counts),
+``_reset_db``s first (the KB tables are truncated + re-seeded the house
+way — deterministic mock embeddings; ``saved_chats`` is never touched
+by the reset), and deletes the rows it creates in a ``finally`` (admin
+cookie).
+"""
+from __future__ import annotations
+
+import asyncio
+import re
+import time
+from pathlib import Path
+from threading import Thread
+from typing import Any
+
+import httpx
+from playwright.sync_api import Browser, BrowserContext, Page, expect
+from sqlalchemy import text
+
+from app.config import Settings
+from app.db import SessionLocal
+from app.rag.importer import ImportSummary, import_sources
+from app.rag.llm import LLMClient
+from e2e.auth_helpers import login
+
+REPO = Path(__file__).resolve().parents[2]
+FIXTURES = REPO / "tests" / "fixtures" / "docs"
+MOCK_ANSWER_MARKER = "Deterministic mock answer for E2E"
+SHARE_URL_RE = re.compile(r"^/shared/[0-9a-f-]{36}$")
+#: The invalid/revoked card's line (frontend/shared.html, phase 51).
+INVALID_TEXT = "This share link is invalid or was revoked."
+#: The toast's clipboard-path line (app.js shareCurrentChat success).
+TOAST_CLIP_TEXT = "Share link copied."
+
+
+async def _import_fixtures(mock_port: int) -> ImportSummary:
+    kwargs: dict[str, Any] = {"_env_file": None, "llm_base_url": f"http://127.0.0.1:{mock_port}/v1"}
+    settings = Settings(**kwargs)  # pyright: ignore[reportCallIssue]
+    return await import_sources([FIXTURES], LLMClient(settings))
+
+
+def _run_in_thread(coro: Any) -> Any:
+    """Run a coroutine on a worker thread.
+
+    Playwright's sync API keeps an asyncio loop running on the test
+    thread, so ``asyncio.run`` cannot be called directly from a test
+    body.
+    """
+    box: dict[str, Any] = {}
+
+    def runner() -> None:
+        try:
+            box["value"] = asyncio.run(coro)
+        except BaseException as e:  # noqa: BLE001 — re-raised on the test thread
+            box["error"] = e
+
+    t = Thread(target=runner)
+    t.start()
+    t.join()
+    if "error" in box:
+        raise box["error"]
+    return box["value"]
+
+
+def _reset_db(mock_port: int, seed: bool) -> ImportSummary | None:
+    """Truncate the KB (and query log + steering notes — deterministic
+    mock answers), then optionally re-import fixtures. ``saved_chats``
+    is deliberately NOT touched: rows persist across suites and every
+    test here cleans up after itself."""
+    with SessionLocal() as db:
+        db.execute(text("TRUNCATE chunks, documents, query_log, steering_notes"))
+        db.commit()
+    if not seed:
+        return None
+    return _run_in_thread(_import_fixtures(mock_port))
+
+
+def _ask(page: Page, question: str) -> None:
+    """Send one turn and wait until the grounded answer has fully
+    landed (the ``done`` event restored the Send button)."""
+    page.fill("#message-input", question)
+    page.click("#send-btn")
+    expect(page.locator(".msg.user .bubble").last).to_contain_text(question)
+    expect(page.locator(".msg.brain .bubble").last).to_contain_text(
+        MOCK_ANSWER_MARKER, timeout=30_000
+    )
+    expect(page.locator("#send-btn")).to_be_enabled()
+    expect(page.locator("#send-label")).to_have_text("Send")
+
+
+def _admin_cookies(page: Page) -> dict[str, str]:
+    """The signed session cookies the browser holds after a form login —
+    used to call the admin API with plain httpx (the test's API side
+    sees exactly what the signed-in browser sees)."""
+    return {
+        c["name"]: c["value"]
+        for c in page.context.cookies()
+        if "name" in c and "value" in c
+    }
+
+
+def _open_admin(browser: Browser, app_url: str) -> tuple[BrowserContext, Page, dict[str, str]]:
+    """A SECOND, logged-in context — the admin's eyes for the management
+    surface (``GET /api/chats`` list/detail, delete, the History
+    Unshare), which stays admin-only since phase 55 task 01."""
+    ctx = browser.new_context(viewport={"width": 1280, "height": 800})
+    pg = ctx.new_page()
+    pg.set_default_timeout(30_000)
+    login(pg, app_url, next="/")
+    return ctx, pg, _admin_cookies(pg)
+
+
+def _chats(app_url: str, cookies: dict[str, str]) -> list[dict[str, Any]]:
+    r = httpx.get(f"{app_url}/api/chats", timeout=10, cookies=cookies)
+    assert r.status_code == 200
+    return r.json()["chats"]
+
+
+def _auto_title(question: str) -> str:
+    """The phase-50 auto-title convention: the first question,
+    whitespace-collapsed, capped at 120 chars."""
+    return " ".join(question.split())[:120]
+
+
+def _find_row(rows: list[dict[str, Any]], title: str) -> dict[str, Any] | None:
+    return next((c for c in rows if c["title"] == title), None)
+
+
+def _title_rows(app_url: str, cookies: dict[str, str], title: str) -> list[dict[str, Any]]:
+    """Every row carrying ``title`` — the "exactly one row" pin (never
+    an absolute count: the shared DB keeps other suites' rows)."""
+    return [c for c in _chats(app_url, cookies) if c["title"] == title]
+
+
+def _delete_chat(app_url: str, cookies: dict[str, str], chat_id: str) -> None:
+    """Best-effort row cleanup (a 404 — already deleted — is fine)."""
+    httpx.delete(f"{app_url}/api/chats/{chat_id}", timeout=10, cookies=cookies)
+
+
+def _wait_saved_row(
+    app_url: str,
+    cookies: dict[str, str],
+    title: str,
+    messages: int = 2,
+) -> dict[str, Any]:
+    """Wait for the auto-saved row (phase 55: auto-saves are SILENT —
+    A2 — so there is no status line to wait on). The upsert is
+    fire-and-forget from the UI's point of view, so poll the admin
+    list until the row with the conversation's auto-title appears with
+    the expected message count."""
+    deadline = time.monotonic() + 15
+    last: dict[str, Any] | None = None
+    while time.monotonic() < deadline:
+        last = _find_row(_chats(app_url, cookies), title)
+        if last is not None and last["message_count"] >= messages:
+            return last
+        time.sleep(0.2)
+    raise AssertionError(f"no auto-saved row for {title!r} (last: {last!r})")
+
+
+def _grant_clipboard(page: Page, app_url: str) -> None:
+    """Grant the async-clipboard permissions on the context.
+
+    ``http://127.0.0.1`` is a secure context, so ``navigator.clipboard``
+    exists — but headless Chromium still requires the permission grant
+    before ``writeText``/``readText`` resolve (without it the
+    owner-locked inline-link fallback fires). The assertion below
+    branches on the API's availability, so a non-secure origin still
+    passes through the fallback branch deterministically.
+    """
+    page.context.grant_permissions(
+        ["clipboard-read", "clipboard-write"], origin=app_url
+    )
+
+
+def _wait_toast_dismissed(page: Page, timeout_s: float = 8.0) -> None:
+    """Poll until the toast's ``is-visible`` state class is gone.
+
+    The auto-dismiss (~4s, A4) drops the class (opacity/transform stay
+    — opacity is not part of Playwright's visibility model, so the
+    class is the honest state pin). The ~8s deadline leaves headroom
+    over the 4s contract without masking a stuck toast."""
+    deadline = time.monotonic() + timeout_s
+    while time.monotonic() < deadline:
+        visible = page.evaluate(
+            "() => { const t = document.querySelector('.toast');"
+            " return !!(t && t.classList.contains('is-visible')); }"
+        )
+        if not visible:
+            return
+        time.sleep(0.2)
+    raise AssertionError("the share toast did not auto-dismiss (~4s contract)")
+
+
+# ---------------------------------------------------------------------------
+# 1. Anonymous auto-save (L4 / A2): no Save control anywhere, one
+#    question → exactly one saved_chats row (auto-title, both messages),
+#    verified through the admin's list — no button press in this test
+# ---------------------------------------------------------------------------
+
+
+def test_anonymous_auto_save(
+    page: Page, browser: Browser, app_url: str, mock_llm: int, db_ready: None
+) -> None:
+    _reset_db(mock_llm, seed=True)
+    page.set_default_timeout(30_000)
+
+    # Anonymous by construction: the page fixture's context never logs
+    # in — this is the signed-out visitor.
+    page.goto(app_url + "/")
+
+    # L4: there is NO Save control at any width — the element is gone
+    # from the DOM (phase 55, task 02), the pills are New chat + Share.
+    expect(page.locator("#save-chat-btn")).to_have_count(0)
+    expect(page.locator("#new-chat-btn")).to_be_visible()
+    expect(page.locator("#share-chat-btn")).to_be_visible()
+
+    q = "How is my Kubernetes cluster set up? (save-ux-auto)"
+    _ask(page, q)  # the ONLY click in this test — no Save press exists
+
+    admin_ctx, _admin, cookies = _open_admin(browser, app_url)
+    created: str | None = None
+    try:
+        # The admin's management list sees the auto-saved row: the
+        # auto-title, both messages, created by the anonymous visitor.
+        row = _wait_saved_row(app_url, cookies, _auto_title(q), messages=2)
+        assert row["message_count"] == 2, "the auto-saved row holds both messages"
+        assert len(_title_rows(app_url, cookies, _auto_title(q))) == 1, (
+            "exactly ONE row for the auto-title — the auto-save must not duplicate"
+        )
+        created = row["id"]
+        # A2 quiet contract: a successful auto-save is SILENT — no toast
+        # (reserved for share) and no error banner on the anonymous page.
+        expect(page.locator(".toast")).to_have_count(0)
+        expect(page.locator("#kb-banner")).to_be_hidden()
+    finally:
+        if created is not None:
+            _delete_chat(app_url, cookies, created)
+        admin_ctx.close()
+
+
+# ---------------------------------------------------------------------------
+# 2. No duplicate across reload (L4): the row link (chatId in
+#    bor.chat.v1, task 02) survives a plain reload — the second
+#    question updates the SAME row (count one, messages 2 → 4)
+# ---------------------------------------------------------------------------
+
+
+def test_no_duplicate_row_across_reload(
+    page: Page, browser: Browser, app_url: str, mock_llm: int, db_ready: None
+) -> None:
+    _reset_db(mock_llm, seed=True)
+    page.set_default_timeout(30_000)
+
+    page.goto(app_url + "/")
+    q1 = "How is my Kubernetes cluster set up? (save-ux-reload)"
+    _ask(page, q1)
+
+    admin_ctx, _admin, cookies = _open_admin(browser, app_url)
+    created: str | None = None
+    try:
+        row = _wait_saved_row(app_url, cookies, _auto_title(q1), messages=2)
+        chat_id: str = row["id"]
+        created = chat_id
+
+        # Plain reload: the conversation restores from localStorage
+        # (both bubbles) — and the row link restores with it.
+        page.reload()
+        expect(page.locator(".msg.user .bubble").last).to_contain_text(q1)
+        expect(page.locator(".msg.brain .bubble").last).to_contain_text(
+            MOCK_ANSWER_MARKER, timeout=30_000
+        )
+
+        # The second question must UPDATE the same row — not spawn a
+        # second one (the unlinked-upgrade path would create a fresh
+        # row; the chatId persistence is what prevents that).
+        q2 = "Which node runs the Kubernetes control plane? (save-ux-reload)"
+        _ask(page, q2)
+        row = _wait_saved_row(app_url, cookies, _auto_title(q1), messages=4)
+        assert row["id"] == chat_id, "the reloaded conversation kept its row link"
+        assert row["message_count"] == 4, "both turns' four messages landed on the row"
+        assert len(_title_rows(app_url, cookies, _auto_title(q1))) == 1, (
+            "still exactly ONE row after the reload — no duplicate"
+        )
+    finally:
+        if created is not None:
+            _delete_chat(app_url, cookies, created)
+        admin_ctx.close()
+
+
+# ---------------------------------------------------------------------------
+# 3. Anonymous share + toast (L3 / L5 / A4): the Share pill is visible
+#    without login; the click mints the link + the top-right toast; a
+#    fresh incognito context reads it read-only; the admin's History
+#    Unshare revokes the same URL
+# ---------------------------------------------------------------------------
+
+
+def test_anonymous_share_toast_and_unshare(
+    page: Page, browser: Browser, app_url: str, mock_llm: int, db_ready: None
+) -> None:
+    _reset_db(mock_llm, seed=True)
+    page.set_default_timeout(30_000)
+
+    # Anonymous by construction — no login anywhere in this test.
+    page.goto(app_url + "/")
+
+    # L3: the Share pill is visible WITHOUT login (static markup — the
+    # phase-51 admin-only reveal gate is gone, task 03).
+    share = page.locator("#share-chat-btn")
+    expect(share).to_be_visible()
+    expect(share).to_have_attribute("aria-label", "Share chat")
+
+    q = "How is my Kubernetes cluster set up? (save-ux-share)"
+    _ask(page, q)
+
+    # A4: the toast is reserved for share — nothing before the click
+    # (the auto-save that just fired is silent).
+    expect(page.locator(".toast")).to_have_count(0)
+
+    _grant_clipboard(page, app_url)
+    share.click()
+
+    # The top-right toast: a SINGLE instance, the visible state class,
+    # the success text, aria-hidden (visual only — #send-status is the
+    # a11y announcer and keeps its phase-51 line).
+    toast = page.locator(".toast")
+    expect(toast).to_have_count(1)
+    expect(toast).to_have_class(re.compile(r"\bis-visible\b"), timeout=15_000)
+    expect(toast).to_have_text(TOAST_CLIP_TEXT)
+    expect(toast).to_have_attribute("aria-hidden", "true")
+    expect(page.locator("#send-status")).to_have_text(TOAST_CLIP_TEXT, timeout=15_000)
+    # A4: it auto-dismisses in ~4s (the class drops; the node stays).
+    _wait_toast_dismissed(page)
+
+    # Read the link — the clipboard when the origin allows it, else the
+    # inline fallback field (the phase-51 owner-locked branch).
+    if page.evaluate("() => !!navigator.clipboard"):
+        link: str | None = page.evaluate("() => navigator.clipboard.readText()")
+        expect(page.locator(".share-link-fallback")).to_have_count(0)
+    else:
+        field = page.locator(".share-link-fallback")
+        expect(field).to_be_visible()
+        link = field.get_attribute("href")
+    assert link is not None and link.startswith(app_url), f"bad share link: {link!r}"
+    path = link.removeprefix(app_url)
+    assert SHARE_URL_RE.fullmatch(path), f"bad share path shape: {path!r}"
+
+    admin_ctx, admin, cookies = _open_admin(browser, app_url)
+    anon_ctx: BrowserContext | None = None
+    created: str | None = None
+    try:
+        # A FRESH incognito context: the guest's only credential is the
+        # token in the URL — the conversation renders read-only.
+        anon_ctx = browser.new_context()
+        anon = anon_ctx.new_page()
+        anon.set_default_timeout(30_000)
+        anon.goto(app_url + path)
+
+        expect(anon.locator("#shared-title")).to_have_text(_auto_title(q))
+        expect(anon.locator(".msg.user .bubble")).to_have_count(1)
+        expect(anon.locator(".msg.user .bubble")).to_contain_text(q)
+        expect(anon.locator(".msg.brain .bubble")).to_have_count(1)
+        expect(anon.locator(".msg.brain .bubble").first).to_contain_text(
+            MOCK_ANSWER_MARKER, timeout=30_000
+        )
+        # The phase-51 zero-controls surface: no composer, no pills,
+        # no Tune/Retry, no button chips — and the guest header.
+        expect(anon.locator("#composer")).to_have_count(0)
+        expect(anon.locator("#save-chat-btn, #share-chat-btn")).to_have_count(0)
+        expect(anon.locator(".tune-btn")).to_have_count(0)
+        expect(anon.locator(".retry-btn")).to_have_count(0)
+        expect(anon.locator("button.suggestion-chip")).to_have_count(0)
+        expect(anon.locator("#sign-in-link")).to_be_visible(timeout=15_000)
+
+        # The API agrees (the admin's eyes): the guest's auto-saved row
+        # carries the SAME /shared/<token> link.
+        row = _find_row(_chats(app_url, cookies), _auto_title(q))
+        assert row is not None, "the guest's auto-saved row must exist"
+        created = row["id"]
+        assert row["share_url"] == path, "the shared row carries the link just used"
+
+        # The admin revokes from the History page (inline two-step —
+        # no native dialog).
+        admin.goto(app_url + "/history.html")
+        tr = admin.locator(
+            "#history-tbody tr", has=admin.locator(f"a[href='/?chat={created}']")
+        )
+        expect(tr.locator("button.history-unshare")).to_be_visible(timeout=15_000)
+        tr.locator("button.history-unshare").click()
+        expect(tr.locator(".history-confirm-text")).to_have_text("Unshare?")
+        expect(tr.locator(".history-confirm-yes")).to_be_visible()
+        tr.locator(".history-confirm-yes").click()
+        expect(tr.locator("button.history-share-create")).to_be_visible(timeout=15_000)
+
+        # The SAME URL is revoked now — in the SAME fresh context.
+        anon.goto(app_url + path)
+        expect(anon.locator("#shared-invalid")).to_be_visible(timeout=15_000)
+        expect(anon.locator("#shared-invalid")).to_contain_text(INVALID_TEXT)
+        expect(anon.locator(".msg")).to_have_count(0)
+
+        # The API agrees: share_url is ABSENT (the omission rule).
+        r = httpx.get(f"{app_url}/api/chats/{created}", timeout=10, cookies=cookies)
+        assert r.status_code == 200
+        assert "share_url" not in r.json(), "unshared → share_url must be absent"
+    finally:
+        if anon_ctx is not None:
+            anon_ctx.close()
+        if created is not None:
+            _delete_chat(app_url, cookies, created)
+        admin_ctx.close()
+
+
+# ---------------------------------------------------------------------------
+# 4. Action-row layout (L6 / A5): horizontal at desktop, stacked at
+#    ≤640px, no horizontal overflow at 360px
+# ---------------------------------------------------------------------------
+
+
+def test_action_row_layout(page: Page, app_url: str, mock_llm: int, db_ready: None) -> None:
+    _reset_db(mock_llm, seed=True)
+    page.set_default_timeout(30_000)
+
+    # No conversation needed — the pills are static markup, always
+    # present (the page fixture's viewport is the 1280×800 desktop).
+    page.goto(app_url + "/")
+
+    new_btn = page.locator("#new-chat-btn")
+    share_btn = page.locator("#share-chat-btn")
+    expect(new_btn).to_be_visible()
+    expect(share_btn).to_be_visible()
+
+    # Both pills live in ONE .chat-actions row, New chat before Share.
+    expect(page.locator(".chat-actions")).to_have_count(1)
+    row_el = page.locator(".chat-actions")
+    assert row_el.locator("#new-chat-btn").count() == 1
+    assert row_el.locator("#share-chat-btn").count() == 1
+    assert page.evaluate(
+        "() => {"
+        " const n = document.getElementById('new-chat-btn');"
+        " const s = document.getElementById('share-chat-btn');"
+        " return !!(n && s && (n.compareDocumentPosition(s) & Node.DOCUMENT_POSITION_FOLLOWING));"
+        " }"
+    ), "the DOM order must be New chat, then Share"
+
+    # Desktop (1280×800): one horizontal row — overlapping y bands,
+    # Share to the right of New chat, each pill at its INTRINSIC width
+    # (never the full 46rem chat column).
+    nb = new_btn.bounding_box()
+    sb = share_btn.bounding_box()
+    assert nb is not None and sb is not None
+    assert nb["y"] < sb["y"] + sb["height"] and sb["y"] < nb["y"] + nb["height"], (
+        f"the pills must share one row (new={nb}, share={sb})"
+    )
+    assert sb["x"] > nb["x"] + nb["width"], "Share must sit right of New chat"
+    column_w = page.evaluate(
+        "() => document.querySelector('.chat-shell').getBoundingClientRect().width"
+    )
+    assert nb["width"] < column_w / 2 and sb["width"] < column_w / 2, (
+        "each pill must keep its intrinsic width on desktop, not stretch the column"
+    )
+
+    # Mobile (390×844): stacked vertically — Share BELOW New chat, both
+    # full-width (the ≤640px stretch rule).
+    page.set_viewport_size({"width": 390, "height": 844})
+    nb = new_btn.bounding_box()
+    sb = share_btn.bounding_box()
+    assert nb is not None and sb is not None
+    assert sb["y"] > nb["y"] + nb["height"], (
+        f"the pills must stack at 390px, Share below New chat (new={nb}, share={sb})"
+    )
+    # Full-width within the column: the stacked pills stretch to the
+    # .chat-actions row (the column's content box — .chat-shell is a
+    # .container, whose getBoundingClientRect includes its padding).
+    row_box = page.locator(".chat-actions").bounding_box()
+    assert row_box is not None
+    assert abs(nb["width"] - sb["width"]) < 2, "the stacked pills share one full width"
+    assert abs(nb["width"] - row_box["width"]) < 2, "the stacked pills stretch the column"
+
+    # 360px wide: no horizontal page overflow (the two stacked pills +
+    # container padding must fit).
+    page.set_viewport_size({"width": 360, "height": 800})
+    scroll_w = page.evaluate("() => document.documentElement.scrollWidth")
+    assert scroll_w <= 360, f"horizontal overflow at 360px: scrollWidth={scroll_w}"
+
+
+# ---------------------------------------------------------------------------
+# 5. Admin still works (A1 sanity): the same auto-save machinery fires
+#    for a signed-in admin — session or not, the row lands
+# ---------------------------------------------------------------------------
+
+
+def test_admin_auto_save_still_works(
+    page: Page, app_url: str, mock_llm: int, db_ready: None
+) -> None:
+    _reset_db(mock_llm, seed=True)
+    page.set_default_timeout(30_000)
+
+    login(page, app_url, next="/")
+    expect(page).to_have_url(app_url + "/", timeout=30_000)
+
+    q = "How is my Kubernetes cluster set up? (save-ux-admin)"
+    _ask(page, q)
+
+    cookies = _admin_cookies(page)
+    created: str | None = None
+    try:
+        row = _wait_saved_row(app_url, cookies, _auto_title(q), messages=2)
+        assert row["message_count"] == 2, "the admin's auto-saved row holds both messages"
+        created = row["id"]
+        expect(page.locator(".toast")).to_have_count(0)  # auto-save is silent (A2)
+    finally:
+        if created is not None:
+            _delete_chat(app_url, cookies, created)

tests/e2e/test_share_chat.py

@@ -6,15 +6,21 @@ Run in isolation (DB must be up: ``podman compose up -d db``):
 
     uv run pytest tests/e2e/test_share_chat.py -v --no-cov
 
-The owner-locked loop under test (2026-08-29, roadmap confirmation):
+The owner-locked loop under test (2026-08-29, roadmap confirmation;
+phase 55 replaced the Save pill with auto-save — by the time the answer
+settles the conversation is already saved, so the chat page's Share
+click is the idempotent share of the linked row):
 
 * **Share from the chat page** — the Share pill (admin-only, ships
-  hidden) on an UNSAVED conversation saves AND shares in ONE action
+  hidden) on the AUTO-SAVED conversation shares the linked row via
-  (``POST /api/chats`` with ``share: true`` — the row appears in
+  ``POST /api/chats/<id>/share`` — the row appears in ``GET
-  ``GET /api/chats`` with a non-null ``share_url`` of the shape
+  /api/chats`` with a non-null ``share_url`` of the shape
-  ``/shared/<uuid4>``); the absolute URL is copied to the clipboard,
+  ``/shared/<uuid4>`` (the unlinked save-then-share one-action wire
-  with the inline-link fallback on a non-secure origin (the assertion
+  path — ``POST /api/chats`` with ``share: true`` — is pinned by the
-  branches on ``navigator.clipboard`` availability);
+  integration suite, guest-reachable since phase 55 task 01); the
+  absolute URL is copied to the clipboard, with the inline-link
+  fallback on a non-secure origin (the assertion branches on
+  ``navigator.clipboard`` availability);
 * **Anonymous view** — a FRESH browser context (a separate session, no
   cookies) opening ``/shared/<token>`` sees the full conversation
   read-only through the same record shape: title = the auto-title,
@@ -49,6 +55,7 @@ from __future__ import annotations
 
 import asyncio
 import re
+import time
 from pathlib import Path
 from threading import Thread
 from typing import Any
@@ -163,6 +170,27 @@ def _delete_chat(app_url: str, cookies: dict[str, str], chat_id: str) -> None:
     httpx.delete(f"{app_url}/api/chats/{chat_id}", timeout=10, cookies=cookies)
 
 
+def _wait_saved_row(
+    app_url: str,
+    cookies: dict[str, str],
+    title: str,
+    messages: int = 2,
+) -> dict[str, Any]:
+    """Wait for the auto-saved row (phase 55: auto-saves are SILENT —
+    A2 — so there is no status line to wait on). The upsert is
+    fire-and-forget from the UI's point of view, so poll the admin
+    list until the row with the conversation's auto-title appears with
+    the expected message count."""
+    deadline = time.monotonic() + 15
+    last: dict[str, Any] | None = None
+    while time.monotonic() < deadline:
+        last = _find_row(_chats(app_url, cookies), title)
+        if last is not None and last["message_count"] >= messages:
+            return last
+        time.sleep(0.2)
+    raise AssertionError(f"no auto-saved row for {title!r} (last: {last!r})")
+
+
 def _grant_clipboard(page: Page, app_url: str) -> None:
     """Grant the async-clipboard permissions on the admin context.
 
@@ -203,8 +231,9 @@ def _click_share_and_assert_status(page: Page, app_url: str) -> None:
 
 
 # ---------------------------------------------------------------------------
-# 1. Share from the chat page: an UNSAVED conversation is saved + shared
+# 1. Share from the chat page: the AUTO-SAVED conversation is shared
-#    in one action; the API row carries the /shared/<uuid> link
+#    (the idempotent share of the linked row — phase 55); the API row
+#    carries the /shared/<uuid> link
 # ---------------------------------------------------------------------------
 
 
@@ -221,25 +250,28 @@ def test_share_from_chat_page(
     _ask(page, q)
 
     # Admin: the Share pill is revealed (ships hidden, whoami reveals
-    # it — the same block as Save). The conversation is UNSAVED at this
+    # it). Phase 55: the conversation is AUTO-SAVED by the time the
-    # point: no row exists yet under the auto-title.
+    # answer settles (the Save pill is gone) — the row exists under the
+    # auto-title, and the Share click below shares the linked row.
     share = page.locator("#share-chat-btn")
     expect(share).to_be_visible()
     expect(share).to_have_attribute("aria-label", "Share chat")
     cookies = _admin_cookies(page)
-    assert (
+    row = _wait_saved_row(app_url, cookies, _auto_title(q))
-        _find_row(_chats(app_url, cookies), _auto_title(q)) is None
+    assert row["message_count"] == 2, "auto-saved with both messages before the Share click"
-    ), "the conversation is unsaved before the Share click"
 
     _grant_clipboard(page, app_url)
     _click_share_and_assert_status(page, app_url)
 
     created: str | None = None
     try:
-        # The API agrees: ONE action saved AND shared — the new row
+        # The API agrees: the Share click shared the auto-saved row —
-        # exists with a non-null share_url of the token shape.
+        # it carries a non-null share_url of the token shape. (The
+        # unlinked save-then-share one-action path is pinned by the
+        # integration suite — from the chat page the conversation is
+        # always linked by the time there is anything to share.)
         row = _find_row(_chats(app_url, cookies), _auto_title(q))
-        assert row is not None, "the Share click must have saved the conversation"
+        assert row is not None, "the auto-saved row must exist"
         assert row["message_count"] == 2, "the saved conversation holds both messages"
         share_url = row.get("share_url")
         assert share_url is not None, "the share_url must be present (non-null)"
@@ -370,15 +402,12 @@ def test_share_from_history_and_unshare(
     q = "How is my Kubernetes cluster set up? (share-history)"
     _ask(page, q)
 
-    # Save first (this test drives the History column, not the
+    # Phase 55: the conversation is already AUTO-SAVED by the time the
-    # save-then-share one-action path — test 1 covers that).
+    # answer settles (no Save pill) — wait for the row via the admin
-    page.locator("#save-chat-btn").click()
+    # list (this test drives the History column).
-    expect(page.locator("#send-status")).to_have_text("Conversation saved.")
-
     cookies = _admin_cookies(page)
     _grant_clipboard(page, app_url)
-    row = _find_row(_chats(app_url, cookies), _auto_title(q))
+    row = _wait_saved_row(app_url, cookies, _auto_title(q))
-    assert row is not None
     chat_id: str = row["id"]
     anon_ctx: BrowserContext | None = None
     try:

tests/e2e/test_sources_midstream_bug.py

@@ -255,10 +255,16 @@ def test_no_orphan_brain_message_when_navigated_before_first_token(
     # Wait until the scratchpad's tail is rendered (phase-17 thinking body,
     # ~2 700 chars / ≈4.5s, lengthened in phase 21) — the 4s pre-content
     # pause (SLOW_PRETOKEN_TRIGGER) is now running, so the navigation below
-    # lands inside pure thinking with a wide margin.
+    # lands inside pure thinking with a wide margin. Explicit timeout:
+    # the mock streams the tail at ≈12 chars / 0.02s (≈4.7s end-to-end),
+    # which outruns Playwright's 5s assertion auto-wait on a loaded host
+    # (the wait started at the FIRST thinking frame — the pre-existing
+    # race, phase 55 task 02 fix).
     thinking = page.locator(".msg.brain").last.locator("details.thinking")
     thinking.wait_for(state="attached", timeout=10_000)
-    expect(thinking.locator(".thinking-text")).to_contain_text(THINKING_TAIL)
+    expect(thinking.locator(".thinking-text")).to_contain_text(
+        THINKING_TAIL, timeout=30_000
+    )
     # Still pre-token: the button is the enabled Stop control (phase 48 —
     # the old disabled "Thinking…" busy state is gone).
     expect(page.locator("#send-btn")).to_be_enabled()

tests/e2e/test_stale_saved_chats.py

@@ -8,10 +8,11 @@ Run in isolation (DB must be up: ``podman compose up -d db``):
 
 The full user-visible invalidation loop under test:
 
-* **Save (fresh)** — as admin: ask (the mock answers deterministically),
+* **Auto-save (fresh, phase 55)** — as admin: ask (the mock answers
-  Save via the chat-page pill; ``GET /api/chats`` (admin cookie) reports
+  deterministically) — the conversation auto-saves at the save points
-  the row with ``stale: false``; opening the FRESH row at ``/?chat=<id>``
+  (the Save pill is gone); ``GET /api/chats`` (admin cookie) reports
-  shows NO banner;
+  the row with ``stale: false``; opening the FRESH row at
+  ``/?chat=<id>`` shows NO banner;
 * **KB change** — the test process (which shares the app's environment)
   bumps the ``sources_meta`` seed row through ``bump_sources_version``
   over a short ``SessionLocal()`` — the exact helper BOTH real sync
@@ -60,6 +61,7 @@ the click.
 from __future__ import annotations
 
 import asyncio
+import time
 import uuid
 from pathlib import Path
 from threading import Thread
@@ -174,11 +176,25 @@ def _ask(page: Page, question: str) -> None:
     expect(page.locator("#send-label")).to_have_text("Send")
 
 
-def _save(page: Page) -> None:
+def _wait_saved_row(
-    """Press Save and wait for the live-region confirmation (the
+    app_url: str,
-    never-stale contract: the status line is the success feedback)."""
+    cookies: dict[str, str],
-    page.locator("#save-chat-btn").click()
+    title: str,
-    expect(page.locator("#send-status")).to_have_text("Conversation saved.")
+    messages: int = 2,
+) -> dict[str, Any]:
+    """Wait for the auto-saved row (phase 55: auto-saves are SILENT —
+    A2 — so there is no status line to wait on). The upsert is
+    fire-and-forget from the UI's point of view, so poll the admin
+    list until the row with the conversation's auto-title appears with
+    the expected message count."""
+    deadline = time.monotonic() + 15
+    last: dict[str, Any] | None = None
+    while time.monotonic() < deadline:
+        last = _find_row(_chats(app_url, cookies), title)
+        if last is not None and last["message_count"] >= messages:
+            return last
+        time.sleep(0.2)
+    raise AssertionError(f"no auto-saved row for {title!r} (last: {last!r})")
 
 
 def _admin_cookies(page: Page) -> dict[str, str]:
@@ -298,11 +314,10 @@ def test_full_invalidation_loop(
     q = "How is my Kubernetes cluster set up? (stale-loop)"
     _ask(page, q)
 
-    # --- Save (fresh): the API agrees, and a fresh open shows NO banner.
+    # --- Auto-save (fresh, phase 55 — no Save pill): the API agrees,
-    _save(page)
+    # and a fresh open shows NO banner.
     cookies = _admin_cookies(page)
-    row = _find_row(_chats(app_url, cookies), _auto_title(q))
+    row = _wait_saved_row(app_url, cookies, _auto_title(q))
-    assert row is not None, "the saved chat row must exist"
     assert row["message_count"] == 2
     assert row["stale"] is False, "a just-saved chat is fresh, not stale"
     chat_id: str = row["id"]
@@ -467,11 +482,9 @@ def test_anonymous_shared_snapshot_has_no_staleness_surface(
 
     q = "How is my Kubernetes cluster set up? (stale-share)"
     _ask(page, q)
-    _save(page)
 
     cookies = _admin_cookies(page)
-    row = _find_row(_chats(app_url, cookies), _auto_title(q))
+    row = _wait_saved_row(app_url, cookies, _auto_title(q))  # auto-saved (phase 55)
-    assert row is not None
     chat_id: str = row["id"]
     anon_ctx: BrowserContext | None = None
     try:

tests/integration/test_chats_api.py

@@ -1,10 +1,13 @@
 """Integration: saved-chat CRUD (phase 50, task 02) — the ``/api/chats``
 contract.
 
-Real Postgres (``podman compose up -d db``). The router sits behind the
+Real Postgres (``podman compose up -d db``). Phase 55 (task 01) split
-phase-16 ``require_admin`` gate exactly like ``/api/steering`` (the
+the phase-16 ``require_admin`` gate: the WRITE surface (``POST`` create
-house pattern of ``test_steering_api.py``): anonymous callers get 403 on
+incl. save-then-share, ``PUT`` re-Save, ``POST /{id}/share``) is public
-every route; the admin CRUD exercises the auto-title convention (first
+— the guest pins below exercise exactly that — while the MANAGEMENT
+surface (list / detail / delete / unshare) stays admin-only (guests get
+403 on exactly those four routes). The admin CRUD pins stay green
+unchanged: the auto-title convention (first
 user message, whitespace-collapsed, 120-char cap + the no-user-message
 fallback), the list order (``updated_at desc, id desc``), the
 full-payload round-trip (a ``bor.chat.v1``-shaped brain record carrying
@@ -161,29 +164,150 @@ def _assert_no_chats(admin_client: TestClient) -> None:
     assert admin_client.get("/api/chats").json() == {"chats": []}
 
 
-# ---------- anonymous: 403 on every route (phase 16 gate) ----------
+# ---------- guest (no session): the public write surface (phase 55,
+# task 01 — the router-wide phase-16 gate moved off POST/PUT/share,
+# onto exactly the four management routes) ----------
 
 
-def test_anonymous_every_route_returns_403(client: TestClient) -> None:
+def test_guest_create_returns_201_with_id_and_auto_title(client: TestClient) -> None:
+    """A guest saves their own conversation (no session cookie): 201,
+    a valid row id, and the same auto-title convention as the admin
+    (first user message) — the save surface is public since phase 55,
+    task 01."""
+    r = client.post("/api/chats", json={"messages": _simple_conversation()})
+    assert r.status_code == 201
+    body = r.json()
+    assert set(body) == OUT_KEYS
+    assert body["title"] == FIRST_QUESTION  # auto-title = first user message
+    assert body["message_count"] == 2
+    assert body["messages"] == _expect(_simple_conversation())
+    uuid.UUID(body["id"])  # valid UUID
+    assert "share_url" not in body  # unshared: the key is ABSENT
+
+
+def test_guest_put_replaces_messages_and_bumps_updated_at(client: TestClient) -> None:
+    """The re-Save upsert is guest-reachable (phase 55, task 01): the
+    same row's messages are fully replaced and ``updated_at`` moves —
+    the auto-save contract (task 02) relies on this working without a
+    session."""
+    created = client.post("/api/chats", json={"messages": _simple_conversation()}).json()
+    updated_before = created["updated_at"]
+
+    time.sleep(0.1)  # now() has µs resolution — make the bump observable
+    new_messages = [
+        _user("How do I prune deleted docs?"),
+        {"who": "brain", "text": "Use --prune."},
+    ]
+    r = client.put(f"/api/chats/{created['id']}", json={"messages": new_messages})
+
+    assert r.status_code == 200
+    body = r.json()
+    assert body["id"] == created["id"]
+    assert body["title"] == FIRST_QUESTION  # absent title keeps the current one
+    assert body["messages"] == _expect(new_messages)  # full replacement
+    assert datetime.fromisoformat(body["updated_at"]) > datetime.fromisoformat(
+        updated_before
+    ), "updated_at must bump on a guest re-Save (onupdate=func.now())"
+
+
+def test_guest_share_returns_share_url_and_is_idempotent(
+    client: TestClient, db: Session
+) -> None:
+    """``POST /{id}/share`` is guest-reachable (phase 55, task 01):
+    200 + ``share_url`` (token shape), the token persists on the row,
+    and a second guest share returns the SAME token (idempotent)."""
+    created = client.post("/api/chats", json={"messages": _simple_conversation()}).json()
+
+    r1 = client.post(f"/api/chats/{created['id']}/share")
+    assert r1.status_code == 200
+    body1 = r1.json()
+    assert set(body1) == {"chat_id", "share_url"}
+    assert body1["chat_id"] == created["id"]
+    assert SHARE_URL_RE.fullmatch(body1["share_url"]), (
+        f"share_url must be /shared/<lowercase uuid>: {body1['share_url']}"
+    )
+    token = uuid.UUID(body1["share_url"].removeprefix("/shared/"))
+    assert _stored_token(db, created["id"]) == token  # persisted on the row
+
+    r2 = client.post(f"/api/chats/{created['id']}/share")
+    assert r2.status_code == 200
+    assert r2.json() == body1, "a guest re-share returns the SAME token"
+    assert _stored_token(db, created["id"]) == token
+
+
+def test_guest_create_with_share_saves_and_shares_in_one_action(
+    client: TestClient, db: Session
+) -> None:
+    """The save-then-share contract, now guest-reachable (phase 55,
+    task 01): ONE request — 201 + ``share_url``, the token persisted in
+    the SAME commit (no second request), and the link reads
+    anonymously the moment the 201 lands."""
+    r = client.post(
+        "/api/chats", json={"messages": _simple_conversation(), "share": True}
+    )
+    assert r.status_code == 201
+    body = r.json()
+    assert set(body) == OUT_KEYS | {"share_url"}
+    assert body["title"] == FIRST_QUESTION  # auto-title applies as for admin
+    assert SHARE_URL_RE.fullmatch(body["share_url"]), (
+        f"share_url must be /shared/<lowercase uuid>: {body['share_url']}"
+    )
+    token = uuid.UUID(body["share_url"].removeprefix("/shared/"))
+    assert _stored_token(db, body["id"]) == token  # same commit, one INSERT
+
+    anon = TestClient(fastapi_app)  # fresh jar: truly anonymous
+    got = anon.get(f"/api{body['share_url']}")
+    assert got.status_code == 200
+    assert set(got.json()) == SHARED_OUT_KEYS
+    assert got.json()["messages"] == _expect(_simple_conversation())
+
+
+def test_guest_is_403_only_on_the_management_surface(client: TestClient) -> None:
+    """The router-wide phase-16 gate MOVED, it did not disappear: a
+    guest (no session cookie) is 403 ``admin only`` on exactly the
+    four management routes — list / detail / delete / unshare (the
+    owner's History surface). The public ``/api/shared/<token>`` read
+    is NOT in this list (it is anonymous by design, as before)."""
     anon = TestClient(fastapi_app)  # fresh jar: truly anonymous
     unknown = uuid.uuid4()
     cases = [
         ("GET", "/api/chats", None),
-        ("POST", "/api/chats", {"messages": _simple_conversation()}),
         ("GET", f"/api/chats/{unknown}", None),
-        ("PUT", f"/api/chats/{unknown}", {"messages": _simple_conversation()}),
         ("DELETE", f"/api/chats/{unknown}", None),
-        ("POST", f"/api/chats/{unknown}/share", None),
         ("POST", f"/api/chats/{unknown}/unshare", None),
     ]
-    # The public read is NOT in this list — it is anonymous by design
-    # (a wrong token 404s there, it never 403s).
     for method, path, body in cases:
         r = anon.request(method, path, json=body)
-        assert r.status_code == 403, f"{method} {path} must be 403 for anonymous"
+        assert r.status_code == 403, f"{method} {path} must be 403 for a guest"
         assert r.json() == {"detail": "admin only"}
 
 
+def test_guest_unshare_403s_but_admin_revocation_still_works(
+    admin_client: TestClient,
+) -> None:
+    """Revocation end-to-end across the split gate (phase 55, task
+    01): the guest who created + shared the chat cannot unshare (403 —
+    the link stays live), but the admin's unshare revokes it — the
+    public ``GET /api/shared/<token>`` read 404s afterwards for guest
+    AND admin (the public read itself is unaffected by this task)."""
+    guest = TestClient(fastapi_app)  # fresh jar: truly anonymous
+    created = guest.post("/api/chats", json={"messages": _simple_conversation()}).json()
+    share_url = guest.post(f"/api/chats/{created['id']}/share").json()["share_url"]
+    anon = TestClient(fastapi_app)  # a second guest, to prove the read
+    assert anon.get(f"/api{share_url}").status_code == 200  # live
+
+    r = guest.post(f"/api/chats/{created['id']}/unshare")
+    assert r.status_code == 403  # management surface — a guest cannot revoke
+    assert r.json() == {"detail": "admin only"}
+    assert anon.get(f"/api{share_url}").status_code == 200  # still live
+
+    assert (
+        admin_client.post(f"/api/chats/{created['id']}/unshare").status_code == 200
+    )
+    assert anon.get(f"/api{share_url}").status_code == 404, "guest: revoked"
+    assert admin_client.get(f"/api{share_url}").status_code == 404, "admin: revoked"
+
+
 # ---------- create ----------
 
 

tests/unit/test_chat_persistence.py

@@ -6,7 +6,10 @@ styles.css so a silent regression (key rename, dropped try/catch, missing
 restore, New chat control lost) is caught without a browser.
 
 Pinned design (PLAN §7.4 note / phase 14):
-* versioned key ``bor.chat.v1`` → ``{v: 1, messages: [...]}``, raw text only;
+* versioned key ``bor.chat.v1`` → ``{v: 1, chatId: string | null,
+  messages: [...]}`` (phase 55 A2: the shape extends IN PLACE with the
+  saved_chats row link — a pre-55 record without it reads as null),
+  raw text only;
 * save points: user message on send, brain message on ``done``;
 * every ``localStorage`` access wrapped in try/catch (failure-safe);
 * size budget ~700k chars, oldest dropped first;
@@ -45,13 +48,28 @@ def _index() -> str:
 
 def test_versioned_storage_key_and_v1_payload() -> None:
     """`bor.chat.v1` (versioned — a format bump is a clean start) with the
-    {v, messages} payload shape (A11: raw localStorage JSON, no library)."""
+    {v, chatId, messages} payload shape (A11: raw localStorage JSON, no
+    library). Phase 55 (A2): the shape extends IN PLACE with `chatId` —
+    the saved_chats row link (null when unlinked), so a reload restores
+    the conversation AND its link; the trimToBudget size probe measures
+    the same shape."""
     js = _js()
     assert 'const STORAGE_KEY = "bor.chat.v1"' in js
     assert "export const STORAGE_VERSION = 1" in js
-    # The payload written to the key is always {v: STORAGE_VERSION, messages}
+    # The write carries the version, the row link, and the trimmed
-    # (two write paths: saveConversation and the trimToBudget size probe).
+    # messages (the single write path — saveConversation).
-    assert js.count("v: STORAGE_VERSION, messages") >= 2
+    save_start = js.find("function saveConversation")
+    save_body = js[save_start : js.find("\n}\n", save_start)]
+    assert "v: STORAGE_VERSION" in save_body
+    assert "chatId: currentChatId" in save_body, (
+        "phase 55: the link is written with the record (null when unlinked)"
+    )
+    assert "trimToBudget(conversation)" in save_body
+    # The size probe measures the same shape (the link is a fixed-length
+    # field — null stands in for the size estimate).
+    probe_start = js.find("function trimToBudget")
+    probe = js[probe_start : js.find("\n}\n", probe_start)]
+    assert "v: STORAGE_VERSION" in probe and "chatId: null" in probe
     # Restore validates the version before trusting anything.
     assert "data.v !== STORAGE_VERSION" in js
 

tests/unit/test_save_chat_ui.py

@@ -1,18 +1,60 @@
-"""Unit: the phase-50 task-03 save-chat contract on the chat page.
+"""Unit: the save/share contract on the chat page (phase 50 → phase 55).
 
-The browser behavior itself is E2E-gated by the story suite (task 05);
+The browser behavior itself is E2E-gated by the story suites (phase 50
-like the other frontend-adjacent unit files, this module pins the
++ phase 55 task 06); like the other frontend-adjacent unit files, this
-JS/CSS/HTML markers the save/load contract depends on, so a silent
+module pins the JS/CSS/HTML markers the save/load contract depends on,
-regression is caught without a browser:
+so a silent regression is caught without a browser:
 
-* the ``currentChatId`` lifecycle (set on create/open, cleared by New
+* phase 55 (A2): the Save pill is GONE — no ``#save-chat-btn`` in
-  chat and by the 404-PUT fallback);
+  index.html, no ``.save-chat-btn`` in styles.css, no ``saveBtn`` /
-* the upsert branch (PUT when linked, POST when not, the 404→recreate
+  ``saveCurrentChat`` symbol in app.js; the headless
-  fallback, the live-region feedback strings);
+  ``persistConversation()`` upsert (PUT when linked, POST when not, the
+  404→recreate fallback) is wired to the save points (the user send in
+  runTurn's ``!reask`` block, ``rememberBrainTurn`` — the pagehide
+  partial rides it, no direct call there) with the A2 quiet contract
+  (one-line status note on failure, NO error banner, silent success)
+  and the module-level ``persisting`` double-fire guard;
+* the ``bor.chat.v1`` record carries ``chatId`` (the row link survives
+  reloads; a pre-55 record without the field reads as null — never
+  throws);
+* the ``currentChatId`` lifecycle (set on create/open, hydrated from the
+  record on the local restore, cleared by New chat and by the 404-PUT
+  fallback);
 * the boot-load precedence (a valid ``?chat=`` uuid + admin replaces the
   local restore and mirrors it to localStorage; anonymous / invalid /
   404 / network → the local restore);
-* the ship-hidden / reveal-for-admin gate on ``#save-chat-btn``.
+* the phase-55 task-03 Share contract on ``#share-chat-btn``: static,
+  ALWAYS-VISIBLE markup — no ``hidden`` attribute, NO reveal step
+  (no ``shareBtn.hidden`` assignment anywhere in app.js), and NEUTRAL
+  error copy on a failed share (the write surface is public — no
+  sign-in wording);
+* phase 55 task 04 (the share-success toast, owner-locked A4):
+  ``showToast`` — the SINGLE aria-hidden ``.toast`` node (lazy-created
+  once, reused — no stacking; text via ``textContent``, never
+  ``innerHTML``; the pending dismiss cleared + reflow forced so a
+  second toast re-runs the entry; ~4s auto-dismiss) is called from
+  BOTH ``shareCurrentChat`` success branches with their own texts and
+  NEVER from a failure branch (the error banner is the failure UI);
+  styles.css ``.toast`` — fixed top-right just under the sticky header
+  (z-index 1000, brand fill — --bg on --brand 5.2:1 AA, a small
+  max-width, hidden by default with ``pointer-events: none``), a ~200ms
+  slide-down + fade entry via ``.toast.is-visible``, and the
+  reduced-motion override (transform dropped for BOTH states, the
+  opacity fade kept);
+* phase 55 task 05 (the action row, owner-locked A5): a single
+  ``<div class="chat-actions">`` in index.html wraps BOTH pills as its
+  element children (DOM order New chat → Share), replacing the two
+  pills as direct children of ``.chat-shell`` — the row sits inside the
+  shell, above ``#messages``, with the kb-banner / stale-banner /
+  steering / announcer structure around it untouched; styles.css
+  ``.chat-actions`` — base ``display: flex; flex-direction: row;
+  align-items: center; gap: 0.6rem`` (the row's cross-axis override of
+  the column's stretch: the pills keep their intrinsic widths, side by
+  side, left-aligned) and the ≤640px override
+  ``flex-direction: column; align-items: stretch; gap: 0.5rem`` (full-
+  width stack, New chat above Share) with the existing ≤640px pill
+  rules (padding, icon/label handling, the ``.chat-shell`` label
+  overrides) left intact for the stacked pills.
 """
 from __future__ import annotations
 
@@ -52,62 +94,29 @@ def _fn(js: str, name: str) -> str:
 # ---------- the Save button on the chat page ----------
 
 
-def test_save_button_ships_hidden_beside_new_chat() -> None:
+def test_save_pill_is_gone_from_the_chat_page() -> None:
-    """#save-chat-btn: a real type=button with the accessible name
+    """Phase 55 (A2): the Save control is RETIRED — there is no
-    "Save chat", SHIPPED HIDDEN (app.js reveals it for admin only),
+    #save-chat-btn anywhere in index.html (at no width), no
-    beside #new-chat-btn in .chat-shell inside <main>, above
+    .save-chat-btn rule anywhere in styles.css (base, ≤900px squeeze,
-    #messages — the two chat-shell actions read as a pair. No other
+    ≤640px overrides), and no saveBtn / saveCurrentChat symbol left in
-    page carries it (chat-page only, like New chat)."""
+    app.js (the headless persistConversation() replaced the handler)."""
     html = _index()
-    btn = re.search(r'<button[^>]*id="save-chat-btn"[^>]*>', html)
+    assert 'id="save-chat-btn"' not in html, "index.html must not carry #save-chat-btn"
-    assert btn, "index.html must contain #save-chat-btn"
+    assert "save-chat-label" not in html, "no Save label left in index.html"
-    tag = btn.group(0)
-    assert 'type="button"' in tag
-    assert 'aria-label="Save chat"' in tag
-    assert "hidden" in tag, "the button ships hidden (reveal is app.js's job)"
-    # Beside New chat: after it, still inside .chat-shell, above #messages.
-    main_idx = html.find('main id="main"')
-    shell_idx = html.find('class="container chat-shell"')
-    new_idx = html.find('id="new-chat-btn"')
-    messages_idx = html.find('id="messages"')
-    assert -1 < main_idx < shell_idx < new_idx < btn.start() < messages_idx, (
-        "the button must sit beside #new-chat-btn in .chat-shell, above #messages"
-    )
-    for other in (SOURCES_HTML, GIT_SOURCES_HTML, DOCUMENT_HTML, LOGIN_HTML, TUNING_HTML):
-        assert 'id="save-chat-btn"' not in other.read_text(encoding="utf-8"), (
-            f"{other.name}: the Save button is chat-page only"
-        )
-
-
-def test_save_button_css_is_the_exact_new_chat_family() -> None:
-    """styles.css: .save-chat-btn carries the EXACT visual family of
-    .new-chat-btn — solid brand pill (--bg on --brand = 5.2:1, AA),
-    borderless, 999px radius, ≥44px target, hover lightens the brand
-    fill; the ≤640px block mirrors the New chat overrides (label stays
-    visible in .chat-shell, icon hidden there; icon-only elsewhere)."""
     css = _css()
-    block = re.search(r"\.save-chat-btn \{([\s\S]*?)\n\}", css)
+    assert "save-chat-btn" not in css, "styles.css must not style .save-chat-btn"
-    assert block, "styles.css must style .save-chat-btn"
+    assert "save-chat-label" not in css, "styles.css must not style .save-chat-label"
-    body = block.group(1)
+    # The ≤900px combined squeeze rule drops the Save pill (New chat +
-    assert "min-height: 44px" in body
+    # auth only).
-    assert "border-radius: 999px" in body
+    tablet = re.search(r"@media \(max-width: 900px\) \{([\s\S]*?)\n\}", css)
-    assert "border: 0" in body
+    assert tablet, "tablet media query missing"
-    assert "background: var(--brand)" in body, "same solid brand fill as New chat"
+    assert ".new-chat-btn, .auth-link { padding: 0.45rem 0.5rem; }" in tablet.group(1), (
-    assert "color: var(--bg)" in body, "--bg text on --brand = 5.2:1 (AA)"
+        "the tablet squeeze rule is New chat + auth only"
-    hover = re.search(r"\.save-chat-btn:hover \{([\s\S]*?)\n\}", css)
-    assert hover and "#f55a72" in hover.group(1), "hover lightens the brand fill"
-    svg = re.search(r"\.save-chat-btn svg \{([\s\S]*?)\n\}", css)
-    assert svg and "display: none" in svg.group(1), "icon hidden on desktop (like New chat)"
-    mobile = re.search(r"@media \(max-width: 640px\) \{([\s\S]*?)\n\}", css)
-    assert mobile, "mobile media query missing"
-    mbody = mobile.group(1)
-    assert ".save-chat-btn { padding: 0.4rem 0.3rem; }" in mbody, "squeezes with New chat"
-    assert ".save-chat-label { display: none; }" in mbody
-    assert ".save-chat-btn svg { display: block; }" in mbody
-    assert ".chat-shell .save-chat-label { display: inline; }" in mbody, (
-        "in .chat-shell the label stays visible, as for New chat"
     )
-    assert ".chat-shell .save-chat-btn svg { display: none; }" in mbody
+    js = _js()
+    assert "saveBtn" not in js, "no saveBtn symbol left in app.js"
+    assert "saveCurrentChat" not in js, "no saveCurrentChat symbol left in app.js"
+    assert 'querySelector("#save-chat-btn")' not in js, "the pill query is gone"
 
 
 # ---------- currentChatId lifecycle ----------
@@ -115,20 +124,27 @@ def test_save_button_css_is_the_exact_new_chat_family() -> None:
 
 def test_current_chat_id_module_scope_and_lifecycle() -> None:
     """currentChatId: module scope, string | null — set to the created
-    row's id on a fresh Save (201), set to the opened id on a
+    row's id on a fresh auto-save (201), set to the opened id on a
-    successful boot load, cleared by "New chat" AND by the 404-PUT
+    successful boot load, hydrated from the record on the local restore
-    fallback (a stale link must never leave the conversation unsaved)."""
+    (phase 55 — the link survives reloads), cleared by "New chat" AND by
+    the 404-PUT fallback (a stale link must never wedge the
+    conversation)."""
     js = _js()
     assert "let currentChatId = null" in js, "module-scope link, null = unlinked"
     # Set on create: the 201 branch links to the created row's id.
-    save_body = _fn(js, "saveCurrentChat")
+    save_body = _fn(js, "persistConversation")
     assert "res.status === 201" in save_body
     assert "currentChatId = String(created.id)" in save_body, (
-        "a fresh Save links to the created row's id"
+        "a fresh auto-save links to the created row's id"
     )
     # Set on open: the boot load links to the fetched id.
     load_body = _fn(js, "restoreSavedChatFromUrl")
     assert "currentChatId = chatId" in load_body
+    # Hydrated on the local restore: the record carries the link.
+    restore_body = _fn(js, "restoreConversation")
+    assert "currentChatId = record ? record.chatId : null" in restore_body, (
+        "the local restore hydrates the link from the record (phase 55)"
+    )
     # Cleared by New chat.
     new_body = _fn(js, "startNewChat")
     assert "currentChatId = null" in new_body, "New chat unlinks"
@@ -137,24 +153,24 @@ def test_current_chat_id_module_scope_and_lifecycle() -> None:
     assert save_body.count("currentChatId = null") >= 1
 
 
-# ---------- the upsert branch ----------
+# ---------- the headless auto-save (phase 55, A2) ----------
 
 
-def test_save_upsert_put_when_linked_post_when_not() -> None:
+def test_persist_conversation_upsert_semantics() -> None:
-    """saveCurrentChat: linked → PUT /api/chats/<id> with the messages
+    """persistConversation (the headless replacement of the phase-50
-    payload (re-Save updates the SAME row — no title in the body, so the
+    Save handler): the EXACT upsert semantics, unchanged — linked →
-    row keeps its current one); unlinked → POST /api/chats (the server
+    PUT /api/chats/<id> with the messages payload (the SAME row updates
-    auto-titles). The 404 from the PUT unlinks and retries as a create.
+    — no title in the body, so the row keeps its current one);
-    Empty conversation → no request, live-region "Nothing to save
+    unlinked → POST /api/chats (the server auto-titles) and link to the
-    yet."; success → live-region "Conversation saved." (status text
+    created id (201). The 404 from the PUT unlinks and retries as a
-    only, no banner); 403/5xx/network → the error banner."""
+    create — a stale link can never wedge the conversation. Empty
+    conversation → no-op (no request, no feedback line)."""
     js = _js()
-    body = _fn(js, "saveCurrentChat")
+    body = _fn(js, "persistConversation")
-    # No-op first: nothing to save → live-region line, no fetch.
+    # No-op first: nothing to save → silent return before any fetch.
-    noop = body.find('sendStatus.textContent = "Nothing to save yet."')
+    noop = body.find("if (!conversation.length) return;")
     first_fetch = body.find("await fetch(")
     assert 0 < noop < first_fetch, "the empty-conversation no-op precedes any fetch"
-    assert "if (!conversation.length)" in body
     # The branch: PUT when linked, POST when not.
     assert "if (currentChatId)" in body
     assert '`/api/chats/${currentChatId}`' in body
@@ -170,46 +186,125 @@ def test_save_upsert_put_when_linked_post_when_not() -> None:
     assert notfound_idx != -1, "the PUT 404 must be handled"
     fallback = body[notfound_idx:post_idx]
     assert "currentChatId = null" in fallback, "the stale link is dropped"
-    # Success is status text only — the live region, never stale — and
+    # The 201 branch links to the created row.
-    # nothing between the 201 link and the success line may raise a
+    assert "res.status === 201" in body
-    # banner (the !res.ok branch returns before either).
+    assert "currentChatId = String(created.id)" in body
-    assert body.count('sendStatus.textContent = "Conversation saved."') == 1
+
-    saved_line = 'sendStatus.textContent = "Conversation saved."'
+
-    between = body[body.find("res.status === 201") : body.find(saved_line)]
+def test_persist_conversation_is_headless_and_quiet() -> None:
-    assert "showErrorBanner" not in between, "no banner on the success path"
+    """The A2 quiet contract: NO error banner anywhere in the helper
-    # Failures raise an actionable banner (non-ok HTTP + network).
+    (the phase-50 banner lines are gone), NO success status text
-    assert 'showErrorBanner("Couldn\'t save the conversation — is the app reachable?")' in body
+    ("Conversation saved." is retired — success is silent; the History
-    assert "check you're still signed in and try again" in body, "403/5xx: actionable line"
+    page is the visible proof), and the failure feedback is the
-    # The double-click guard releases on EVERY outcome.
+    one-line #send-status note — on BOTH failure paths (non-ok HTTP and
-    finally_idx = body.rfind("finally")
+    network) — with the "next save point retries" promise. The
-    assert finally_idx != -1 and "saveBtn.disabled = false" in body[finally_idx:], (
+    module-level `persisting` flag is the double-fire guard (released
-        "the button is re-enabled in the finally — never stale"
+    in the finally — never stuck)."""
+    js = _js()
+    body = _fn(js, "persistConversation")
+    assert "showErrorBanner" not in body, "A2: a failed auto-save never raises a banner"
+    assert "Conversation saved." not in body, "A2: success is silent (no status text)"
+    note = "Couldn't save automatically — will try on the next message."
+    assert body.count(note) == 2, "the one-line note covers non-ok AND network failure"
+    # The non-ok branch notes and returns (no banner, no 201 handling).
+    notok = body.find("if (!res.ok)")
+    first_note = body.find(note)
+    assert -1 < notok < first_note, "the non-ok branch lands on the one-line note"
+    # The network path (catch) notes too.
+    catch_idx = body.find("} catch {")
+    assert catch_idx != -1 and first_note < body.rfind(note) < body.rfind("finally"), (
+        "the catch branch carries the second note"
     )
+    # The module-level double-fire guard, released on EVERY outcome.
+    assert re.search(r"^let persisting = false", js, re.M), (
+        "the persisting flag is module scope (save points can overlap)"
+    )
+    assert "if (persisting) return;" in body, "an in-flight upsert skips the second call"
+    assert "persisting = true;" in body
+    finally_idx = body.rfind("finally")
+    assert finally_idx != -1 and "persisting = false" in body[finally_idx:], (
+        "the flag is released in the finally — never stuck"
+    )
+
+
+def test_auto_save_wired_to_the_save_points() -> None:
+    """The headless helper is referenced from the save points: the user
+    send (runTurn's ``!reask`` block — after the localStorage
+    saveConversation()) and the brain save point (rememberBrainTurn —
+    after its saveConversation()). The pagehide partial rides
+    rememberBrainTurn: NO second direct call there."""
+    js = _js()
+    # Save point 1: the user send in runTurn's !reask block.
+    turn = js.find("async function runTurn")
+    reask_block = js[js.find("if (!reask) {", turn) : js.find("let wrap = null", turn)]
+    save1 = reask_block.find("saveConversation();")
+    persist1 = reask_block.find("persistConversation();")
+    assert -1 < save1 < persist1, "the user-send save point rides persistConversation()"
+    # Save point 2: rememberBrainTurn (the brain-done + stop + pagehide path).
+    body = _fn(js, "rememberBrainTurn")
+    save2 = body.find("saveConversation();")
+    persist2 = body.find("persistConversation();")
+    assert -1 < save2 < persist2, "the brain save point rides persistConversation()"
+    # The pagehide handler itself carries no direct persist call — the
+    # partial rides rememberBrainTurn (no extra wiring, phase 20
+    # contract untouched).
+    m = re.search(r'window\.addEventListener\("pagehide", \(\) => \{([\s\S]*?)\n\}\);', js)
+    assert m, "the pagehide handler must exist"
+    assert "persistConversation" not in m.group(1), (
+        "the pagehide partial rides rememberBrainTurn — no second call"
+    )
+
+
+def test_record_carries_the_row_link() -> None:
+    """Phase 55 (A2): the bor.chat.v1 record carries ``chatId``. The
+    write (saveConversation) persists the CURRENT currentChatId (null
+    when unlinked) with the versioned record; the reader
+    (loadStoredRecord) reads it back with old-record safety — a
+    pre-55 record without the field (or a non-string) reads as null,
+    never throws; the restore validates the version before trusting
+    anything."""
+    js = _js()
+    save_body = _fn(js, "saveConversation")
+    assert "chatId: currentChatId" in save_body, ("the write persists the current link")
+    assert "v: STORAGE_VERSION" in save_body
+    assert "trimToBudget(conversation)" in save_body
+    read_body = _fn(js, "loadStoredRecord")
+    assert "data.v !== STORAGE_VERSION" in read_body, "version validated first"
+    assert "Array.isArray(data.messages)" in read_body
+    # Old-record safety: optional field, string check, null fallback.
+    assert 'typeof data.chatId === "string"' in read_body
+    assert "data.chatId.length ? data.chatId : null" in read_body
+    # The defensive message filter survives the reshape.
+    assert 'm.who === "user" || m.who === "brain"' in read_body
+    assert 'typeof m.text === "string"' in read_body
 
 
 # ---------- boot-load precedence ----------
 
 
 def test_boot_load_precedence_saved_chat_over_local_restore() -> None:
-    """Inside the boot IIFE: after fetchIsAdmin() + the reveal gate,
+    """Inside the boot IIFE: after fetchIsAdmin(), restoreSavedChatFromUrl()
-    restoreSavedChatFromUrl() runs; only when it returns false does the
+    runs; only when it returns false does the phase-14 local restore run
-    phase-14 local restore run. Header init stays first (shared-module
+    (which hydrates the row link from the record — phase 55). Header init
-    contract)."""
+    stays first (shared-module contract). The phase-50 Save-reveal line is
+    GONE — and phase 55 task 03 removed the Share-reveal line too (the
+    pill is static, always-visible markup: no reveal step at boot)."""
     js = _js()
     boot_start = js.find("(async () => {")
     assert boot_start != -1, "the boot IIFE must exist"
     boot = js[boot_start:]
     init_i = boot.find("await initSharedHeader();")
     admin_i = boot.find("isAdmin = await fetchIsAdmin();")
-    reveal_i = boot.find("saveBtn.hidden = !isAdmin")
     saved_i = boot.find("await restoreSavedChatFromUrl();")
     local_i = boot.find("restoreConversation();")
-    assert -1 < init_i < admin_i < reveal_i < saved_i < local_i, (
+    assert -1 < init_i < admin_i < saved_i < local_i, (
-        "boot order: header init → whoami → Save reveal → ?chat= load → local fallback"
+        "boot order: header init → whoami → ?chat= load → local fallback"
     )
+    assert "shareBtn.hidden" not in boot, ("no Share-reveal line left in boot (phase 55 task 03)")
     assert "if (!openedSaved) restoreConversation();" in boot, (
         "the local restore runs ONLY when the saved-chat load did not open"
     )
+    assert "saveBtn" not in boot, "no Save-reveal line left in boot (phase 55)"
 
 
 def test_boot_load_gates_valid_uuid_and_admin_only() -> None:
@@ -261,20 +356,17 @@ def test_boot_load_gates_valid_uuid_and_admin_only() -> None:
 # ---------- the reveal gate ----------
 
 
-def test_save_button_revealed_only_for_admin() -> None:
+def test_no_save_pill_wiring_left_in_app_js() -> None:
-    """The ship-hidden/reveal-for-admin contract: app.js queries
+    """Phase 55 (A2): the Save pill's wiring is GONE — no
-    #save-chat-btn, binds the click to saveCurrentChat, and the boot
+    #save-chat-btn query, no click binding to a save handler, no boot
-    IIFE sets saveBtn.hidden = !isAdmin (phase 16 absent-not-hidden —
+    reveal line. The headless persistConversation() replaces all of it
-    hidden is display:none, no trace for anonymous)."""
+    (no button, no admin gate: every visitor's conversation auto-saves
+    — the write surface is public, phase 55 task 01)."""
     js = _js()
-    assert 'document.querySelector("#save-chat-btn")' in js
+    assert 'querySelector("#save-chat-btn")' not in js, "the pill query is gone"
-    assert 'saveBtn?.addEventListener("click", saveCurrentChat)' in js
+    assert "saveCurrentChat" not in js, "the button handler is gone"
-    assert "saveBtn.hidden = !isAdmin" in js, "revealed for admin only, at boot"
+    assert 'addEventListener("click", saveCurrentChat)' not in js, "no save binding"
-    # The reveal happens in the boot IIFE (after whoami), not at module
+    assert "saveBtn" not in js, "no saveBtn symbol anywhere (the tune form uses its own)"
-    # evaluation (isAdmin is false there).
-    boot_start = js.find("(async () => {")
-    reveal = js.find("saveBtn.hidden = !isAdmin")
-    assert boot_start < reveal, "the reveal must run at boot, after whoami resolves"
 
 
 def test_boot_load_adds_no_direct_storage_access() -> None:
@@ -296,29 +388,32 @@ def test_no_cdn_added() -> None:
 # ---------- the Share button on the chat page (phase 51, task 02) ----------
 
 
-def test_share_button_ships_hidden_beside_save() -> None:
+def test_share_button_ships_visible_beside_new_chat() -> None:
     """#share-chat-btn: a real type=button with the accessible name
-    "Share chat", SHIPPED HIDDEN (app.js reveals it for admin only),
+    "Share chat", SHIPPED VISIBLE to every visitor (phase 55 task 03 —
-    BESIDE #save-chat-btn in .chat-shell inside <main>, above
+    NO ``hidden`` attribute, no reveal step; the phase-51 admin-only
-    #messages — the chat-shell actions read as a pair (Save | Share).
+    ship-hidden gate is gone), BESIDE #new-chat-btn in .chat-shell
-    No other page carries it (chat-page only, like Save)."""
+    inside <main>, above #messages — the chat-shell actions read as a
+    pair (New chat | Share; the Save pill is gone, phase 55). No other
+    page carries it (chat-page only, like New chat)."""
     html = _index()
     btn = re.search(r'<button[^>]*id="share-chat-btn"[^>]*>', html)
     assert btn, "index.html must contain #share-chat-btn"
     tag = btn.group(0)
     assert 'type="button"' in tag
     assert 'aria-label="Share chat"' in tag
-    assert "hidden" in tag, "the button ships hidden (reveal is app.js's job)"
+    assert "hidden" not in tag, ("the button ships visible — no reveal step (phase 55 task 03)")
     # The label: the visible text is "Share" (the link SVG is aria-hidden
     # decoration; the aria-label carries the accessible name).
     btn_block = html[btn.start() : html.find("</button>", btn.start())]
     assert '>Share</span>' in btn_block
-    # Beside Save: after it, still inside .chat-shell, above #messages.
+    # Beside New chat (the Save pill is gone): after it, still inside
+    # .chat-shell, above #messages.
     shell_idx = html.find('class="container chat-shell"')
-    save_idx = html.find('id="save-chat-btn"')
+    new_idx = html.find('id="new-chat-btn"')
     messages_idx = html.find('id="messages"')
-    assert -1 < shell_idx < save_idx < btn.start() < messages_idx, (
+    assert -1 < shell_idx < new_idx < btn.start() < messages_idx, (
-        "the button must sit beside #save-chat-btn in .chat-shell, above #messages"
+        "the button must sit beside #new-chat-btn in .chat-shell, above #messages"
     )
     for other in (SOURCES_HTML, GIT_SOURCES_HTML, DOCUMENT_HTML, LOGIN_HTML,
                   TUNING_HTML, Path(FRONTEND / "history.html")):
@@ -328,11 +423,13 @@ def test_share_button_ships_hidden_beside_save() -> None:
 
 
 def test_share_button_css_is_the_exact_save_family() -> None:
-    """styles.css: .share-chat-btn carries the EXACT visual family of
+    """styles.css: .share-chat-btn carries the EXACT visual family of the
-    .save-chat-btn (same solid brand pill — --bg on --brand = 5.2:1, AA;
+    phase-50 Save pill (now the .new-chat-btn family — the Save rules
-    borderless; 999px radius; ≥44px target; hover lightens the brand
+    are gone with the pill, phase 55): same solid brand pill — --bg on
-    fill); the ≤640px block mirrors the Save overrides (label stays
+    --brand = 5.2:1, AA; borderless; 999px radius; ≥44px target; hover
-    visible in .chat-shell, icon hidden there; icon-only elsewhere)."""
+    lightens the brand fill; the ≤640px block mirrors the New chat
+    overrides (label stays visible in .chat-shell, icon hidden there).
+    """
     css = _css()
     block = re.search(r"\.share-chat-btn \{([\s\S]*?)\n\}", css)
     assert block, "styles.css must style .share-chat-btn"
@@ -368,9 +465,11 @@ def test_share_current_chat_save_then_share_branch() -> None:
     copied — the clipboard try succeeds → the live region reads
     "Share link copied."; the rejection (a non-secure http origin)
     renders the .share-link-fallback field + "Share link ready — copy it
-    from the field." 403/5xx → the actionable banner (signed-out hint);
+    from the field." 403/5xx → the actionable banner (NEUTRAL "try
-    network → the reachable? banner. The double-click guard releases in
+    again" — the write surface is public, phase 55 task 01, so a 403
-    the finally — never stale."""
+    is no longer a sign-in problem for a guest); network → the
+    reachable? banner. The double-click guard releases in the finally —
+    never stale."""
     js = _js()
     body = _fn(js, "shareCurrentChat")
     # No-op first: nothing to share → live-region line, no fetch.
@@ -405,11 +504,15 @@ def test_share_current_chat_save_then_share_branch() -> None:
         '      : "Share link ready — copy it from the field."'
     ) in body
     # Failures raise an actionable banner (non-ok HTTP + network).
+    # Phase 55 task 03: the 403/5xx copy is NEUTRAL ("try again") — no
+    # sign-in wording anywhere in the share handler (the write surface
+    # is public); the network banner keeps its own line.
     assert 'showErrorBanner("Couldn\'t share the conversation — is the app reachable?")' in body
-    assert "check you're still signed in and try again" in body, "403/5xx: actionable line"
+    neutral = "Couldn't share the conversation — try again."
-    assert body.count("check you're still signed in and try again") == 2, (
+    assert body.count(neutral) == 2, (
-        "both the linked and the unlinked branch carry the non-ok banner"
+        "both the linked and the unlinked branch carry the neutral non-ok banner"
     )
+    assert "signed in" not in body, "no sign-in wording left in the share handler (task 03)"
     # The double-click guard releases on EVERY outcome.
     finally_idx = body.rfind("finally")
     assert finally_idx != -1 and "shareBtn.disabled = false" in body[finally_idx:], (
@@ -430,23 +533,239 @@ def test_share_current_chat_save_then_share_branch() -> None:
     assert "document.createRange()" in sel and "selectNodeContents(el)" in sel
 
 
-def test_share_button_revealed_only_for_admin() -> None:
+def test_share_button_has_no_reveal_gate() -> None:
-    """The ship-hidden/reveal-for-admin contract: app.js queries
+    """Phase 55 task 03: the pill is VISIBLE TO EVERY VISITOR — app.js
-    #share-chat-btn, binds the click to shareCurrentChat, and the boot
+    queries #share-chat-btn and binds the click to shareCurrentChat, but
-    IIFE sets shareBtn.hidden = !isAdmin in the SAME admin-reveal block
+    there is NO reveal step: no ``shareBtn.hidden`` assignment ANYWHERE
-    as Save (phase 16 absent-not-hidden — no trace for anonymous)."""
+    in app.js (the phase-51 ship-hidden/admin-reveal gate is gone; the
+    markup ships visible and task 01 opened the write surface to all).
+    """
     js = _js()
     assert 'document.querySelector("#share-chat-btn")' in js
     assert 'shareBtn?.addEventListener("click", shareCurrentChat)' in js
-    assert "shareBtn.hidden = !isAdmin" in js, "revealed for admin only, at boot"
+    assert "shareBtn.hidden" not in js, "no reveal step — the pill ships visible to all"
-    # The reveal happens in the boot IIFE (after whoami), not at module
+
-    # evaluation — and right next to Save's own reveal line.
+
-    boot_start = js.find("(async () => {")
+# ---------- the share-success toast (phase 55, task 04, A4) ----------
-    reveal = js.find("shareBtn.hidden = !isAdmin")
+
-    save_reveal = js.find("saveBtn.hidden = !isAdmin")
+
-    assert boot_start < save_reveal < reveal, (
+def test_show_toast_helper_single_instance_and_aria_hidden() -> None:
-        "the Share reveal joins the same admin-reveal block as Save"
+    """showToast (A4 owner-locked): a SINGLE node — lazy-created on the
+    first call and REUSED thereafter (toasts never stack), a plain
+    ``<div class="toast">`` appended to ``document.body``; the text
+    lands via ``textContent`` (XSS-safe — never innerHTML); the node is
+    ``aria-hidden="true"`` (visual only — #send-status is the
+    announcer). Re-triggering the entry (a second share while the first
+    toast is up): clear the pending dismiss timer, remove the visible
+    state class, force a reflow (``offsetWidth`` — restarts the CSS
+    transition), re-add the class. Auto-dismiss: a 4000ms timer set
+    AFTER the visible class is added, removing the class on fire."""
+    js = _js()
+    body = _fn(js, "showToast")
+    # Lazy single instance, appended to <body>, marked visual-only.
+    assert "if (!toastEl)" in body, "the node is created once, on first use"
+    assert 'document.createElement("div")' in body
+    assert 'toastEl.className = "toast"' in body
+    assert 'toastEl.setAttribute("aria-hidden", "true")' in body, ("A4: visual only")
+    assert "document.body.appendChild(toastEl)" in body
+    # textContent only — never innerHTML.
+    assert "toastEl.textContent = message" in body
+    assert "innerHTML" not in body, "XSS contract: textContent only"
+    # Single instance: module-scope node + timer, reused (no stacking).
+    assert re.search(r"^let toastEl = null", js, re.M), ("the node is module scope")
+    assert re.search(r"^let toastTimer = 0", js, re.M), ("the timer is module scope")
+    # Re-trigger order: clear dismiss → remove class → force reflow →
+    # re-add the visible class.
+    clear_i = body.find("clearTimeout(toastTimer)")
+    remove_i = body.find('toastEl.classList.remove("is-visible")')
+    reflow_i = body.find("void toastEl.offsetWidth")
+    add_i = body.find('toastEl.classList.add("is-visible")')
+    assert -1 < clear_i < remove_i < reflow_i < add_i, (
+        "dismiss cleared → class removed → reflow forced → visible re-added"
     )
+    # Auto-dismiss ~4s, armed AFTER the visible class is set.
+    timer_i = body.find("setTimeout")
+    assert -1 < add_i < timer_i and "4000" in body
+    assert 'toastEl.classList.remove("is-visible")' in body[timer_i:], (
+        "the pending dismiss removes the visible state"
+    )
+
+
+def test_toast_called_from_both_share_success_branches_only() -> None:
+    """shareCurrentChat (task 04): BOTH success paths call showToast
+    with their own text — the clipboard path → "Share link copied.",
+    the fallback-field path → "Share link ready — copy it from the
+    field." — and both calls ride the SUCCESS branch (after the copy,
+    after the untouched #send-status live-region lines). showToast
+    appears EXACTLY twice in the handler and never in a failure branch
+    (the two !res.ok banners precede the copy; the network catch —
+    the error banner is the failure UI — carries no toast)."""
+    js = _js()
+    body = _fn(js, "shareCurrentChat")
+    assert body.count("showToast(") == 2, "exactly one toast per success path"
+    copy_i = body.find("copyShareLinkWithFallback(absoluteShareUrl(shareUrl))")
+    assert copy_i != -1, "the copy (the success branch) must exist"
+    t1 = body.find('showToast("Share link copied.")')
+    t2 = body.find('showToast("Share link ready — copy it from the field.")')
+    assert t1 != -1 and t2 != -1, "both success paths toast their own text"
+    assert -1 < copy_i < min(t1, t2), ("the toasts ride the SUCCESS branch (after the copy)")
+    # The #send-status lines stay exactly as they were (the a11y
+    # announcer) and precede the toast calls.
+    status_i = body.find("sendStatus.textContent = copied")
+    assert -1 < status_i < min(t1, t2)
+    # Never on failure: the catch block carries no toast.
+    catch_i = body.rfind("} catch {")
+    assert catch_i != -1 and "showToast" not in body[catch_i:], (
+        "a failed share shows the error banner, no toast"
+    )
+
+
+def test_toast_css_top_right_brand_family_and_reduced_motion() -> None:
+    """styles.css (task 04): .toast — position: fixed, top-right just
+    under the sticky header (--header-h + offset — the variable steps
+    64px → 58px at ≤640px), z-index 1000 (the modal overlay contract —
+    above the header's 20), a small max-width so long text wraps, the
+    solid brand fill (--bg text on --brand = 5.2:1, AA — the
+    .new-chat-btn family), rounded + shadowed. Hidden by default
+    (opacity 0 + pointer-events: none — it never intercepts clicks when
+    idle) and resting at translateY(-8px), with the ~200ms entry
+    transition; .toast.is-visible lands at opacity 1 / translateY(0).
+    Under prefers-reduced-motion: reduce the transform is dropped for
+    BOTH states (.is-visible would otherwise out-specify the bare
+    .toast) and the opacity fade remains."""
+    css = _css()
+    block = re.search(r"\.toast \{([\s\S]*?)\n\}", css)
+    assert block, "styles.css must style .toast"
+    body = block.group(1)
+    for prop in (
+        "position: fixed",
+        "top: calc(var(--header-h) + 0.75rem)",
+        "right: 1rem",
+        "z-index: 1000",
+        "max-width: min(22rem, calc(100vw - 2rem))",
+        "background: var(--brand)",
+        "color: var(--bg)",
+        "border-radius: var(--radius-sm)",
+        "box-shadow: var(--shadow)",
+        "opacity: 0",
+        "pointer-events: none",
+        "transform: translateY(-8px)",
+    ):
+        assert prop in body, f".toast must keep {prop}"
+    assert "transition:" in body and "200ms" in body, ("the entry is a ~200ms slide-down + fade")
+    visible = re.search(r"\.toast\.is-visible \{([\s\S]*?)\n\}", css)
+    assert visible, "the .toast.is-visible state class (toggled by showToast) must exist"
+    assert "opacity: 1" in visible.group(1)
+    assert "transform: translateY(0)" in visible.group(1)
+    # The reduced-motion override: transform dropped (BOTH states
+    # named), the opacity fade kept.
+    rm = None
+    for m in re.finditer(r"@media \(prefers-reduced-motion: reduce\) \{([\s\S]*?)\n\}", css):
+        if ".toast" in m.group(1):
+            rm = m.group(1)
+            break
+    assert rm is not None, "a reduced-motion block must cover .toast"
+    assert ".toast.is-visible { transform: none; }" in rm, ("the slide is dropped for BOTH states")
+    assert re.search(r"\.toast \{ transition: opacity", rm), ("the opacity fade remains")
+
+
+# ---------- the chat-actions row (phase 55, task 05, A5) ----------
+
+
+def test_chat_actions_wrapper_holds_both_pills_in_order() -> None:
+    """index.html (task 05, A5): ONE ``<div class="chat-actions">``
+    wraps BOTH pills — its element children are exactly the two
+    buttons, in the A5 order New chat → Share. The wrapper replaces
+    the two pills as direct children of ``.chat-shell`` (a normal
+    column child): inside the shell, above ``#messages``; nothing else
+    lands between the steering announcer and the row, and nothing but
+    the phase-49 comment lands between the row and ``#messages``. No
+    other page carries ``.chat-actions`` (chat-page only, like the
+    pills)."""
+    html = _index()
+    start = html.find('<div class="chat-actions">')
+    assert start != -1, "index.html must carry the .chat-actions wrapper"
+    end = html.find("</div>", start)
+    assert end != -1, "the wrapper must close"
+    wrap = html[start:end]
+    # Exactly two element children: the two pill buttons, New chat first.
+    assert wrap.count("<div") == 1, "no nested div inside the row wrapper"
+    assert wrap.count("<button") == 2, "the row holds exactly the two pills"
+    new_i = wrap.find('id="new-chat-btn"')
+    share_i = wrap.find('id="share-chat-btn"')
+    assert -1 < new_i < share_i, "A5 order: New chat first, then Share"
+    # Position: a .chat-shell column child, above #messages — the
+    # kb-banner / stale-banner / steering / announcer structure is
+    # untouched (nothing else with an id around the row).
+    shell_idx = html.find('class="container chat-shell"')
+    messages_idx = html.find('id="messages"')
+    assert -1 < shell_idx < start < end < messages_idx, (
+        "the row is a .chat-shell column child, above #messages"
+    )
+    ann_idx = html.find('id="steering-announcer"')
+    between = html[html.find("</p>", ann_idx):start]
+    assert "id=" not in between and "<button" not in between, (
+        "no other element lands between the announcer and the row"
+    )
+    after = html[end:messages_idx]
+    assert "id=" not in after and "<button" not in after, (
+        "nothing but the phase-49 comment lands between the row and #messages"
+    )
+    for other in (SOURCES_HTML, GIT_SOURCES_HTML, DOCUMENT_HTML, LOGIN_HTML,
+                  TUNING_HTML, Path(FRONTEND / "history.html")):
+        assert "chat-actions" not in other.read_text(encoding="utf-8"), (
+            f"{other.name}: the action row is chat-page only"
+        )
+
+
+def test_chat_actions_row_on_desktop_and_stack_at_640() -> None:
+    """styles.css (task 05, A5): the base ``.chat-actions`` rule is a
+    horizontal flex row — ``display: flex; flex-direction: row;
+    align-items: center; gap: 0.6rem``. The ``align-items: center`` is
+    load-bearing: the wrapper is a flex ITEM of the ``.chat-shell``
+    column (which stretches its items), and the row's own
+    cross-axis ``center`` (not the column default ``stretch``) keeps
+    each pill at its intrinsic content width — two pills side by side,
+    left-aligned, never full-column. The ≤640px override flips the
+    row to a full-width vertical stack — ``flex-direction: column;
+    align-items: stretch; gap: 0.5rem`` (New chat above Share) — and
+    the EXISTING ≤640px pill rules (padding squeeze, the icon/label
+    handling, the ``.chat-shell`` label overrides) stay in place for
+    the stacked pills."""
+    css = _css()
+    block = re.search(r"\.chat-actions \{([\s\S]*?)\n\}", css)
+    assert block, "styles.css must style .chat-actions (base row)"
+    for prop in (
+        "display: flex",
+        "flex-direction: row",
+        "align-items: center",
+        "gap: 0.6rem",
+    ):
+        assert prop in block.group(1), f".chat-actions must keep {prop}"
+    mobile = re.search(r"@media \(max-width: 640px\) \{([\s\S]*?)\n\}", css)
+    assert mobile, "mobile media query missing"
+    mbody = mobile.group(1)
+    m = re.search(r"\.chat-actions \{([^}]*)\}", mbody)
+    assert m, "the ≤640px override (vertical stack) must exist"
+    for prop in (
+        "flex-direction: column",
+        "align-items: stretch",
+        "gap: 0.5rem",
+    ):
+        assert prop in m.group(1), f"the ≤640px .chat-actions must keep {prop}"
+    # The stacked pills keep their existing mobile treatment (the rules
+    # the phase-50/51 pairs established — untouched by this task).
+    for rule in (
+        ".new-chat-btn { padding: 0.4rem 0.3rem; }",
+        ".share-chat-btn { padding: 0.4rem 0.3rem; }",
+        ".new-chat-label { display: none; }",
+        ".share-chat-label { display: none; }",
+        ".chat-shell .new-chat-label { display: inline; }",
+        ".chat-shell .new-chat-btn svg { display: none; }",
+        ".chat-shell .share-chat-label { display: inline; }",
+        ".chat-shell .share-chat-btn svg { display: none; }",
+    ):
+        assert rule in mbody, f"the existing ≤640px pill rule must stay: {rule}"
 
 
 # ---------- stale saved chat: banner + Regenerate (phase 53, task 05) ----------
@@ -571,7 +890,7 @@ def test_stale_regenerate_persists_the_linked_row() -> None:
     """The post-regenerate persist (the existing upsert path): linked →
     PUT /api/chats/<id> (the server re-stamps sources_version → the row
     is fresh); a 404 (the row was deleted from History meanwhile)
-    follows saveCurrentChat's stale-link rule — unlink + recreate
+    follows persistConversation's stale-link rule — unlink + recreate
     (POST), and the recreate links the new id. Success hides the banner
     AND announces the outcome in the #send-status live region; 403/5xx
     → the actionable error banner (the row stays as the turn left it);
@@ -616,19 +935,22 @@ def test_stale_regenerate_binding_and_element_queries() -> None:
     assert 'staleRegenBtn?.addEventListener("click", regenerateStaleChat)' in js
 
 
-def test_stale_banner_cleared_on_new_chat_and_resave() -> None:
+def test_stale_banner_cleared_on_new_chat_and_autosave() -> None:
     """Never-stale (PLAN §7.4): "New chat" replaces the conversation the
     banner described (and unlinks it) — the banner hides; a successful
-    manual re-Save re-stamps the row to the current generation (task
+    auto-save re-stamps the row to the current generation (task 03) —
-    03) — the banner is done the moment the save succeeds."""
+    the banner is done the moment the save succeeds (on the success
+    path only — after the !res.ok early return and the 201 link)."""
     js = _js()
     new_body = _fn(js, "startNewChat")
     assert "staleBanner.hidden = true" in new_body, "New chat hides the banner"
-    save_body = _fn(js, "saveCurrentChat")
+    save_body = _fn(js, "persistConversation")
-    saved_line = 'sendStatus.textContent = "Conversation saved."'
+    notok_idx = save_body.find("if (!res.ok)")
-    after = save_body[save_body.find(saved_line):]
+    two01_idx = save_body.find("res.status === 201")
-    assert "staleBanner.hidden = true" in after, (
+    hide_idx = save_body.find("staleBanner.hidden = true")
-        "a successful re-save re-stamps the row — the banner is done"
+    catch_idx = save_body.find("} catch {")
+    assert -1 < notok_idx < two01_idx < hide_idx < catch_idx, (
+        "the banner clears on the success path, after the 201 link, never on failure"
     )