phase: 149_sync_progress_box

All verification complete. The `ink-soft`/`--surface` pair the box uses is already pinned AA by the existing theme E2E suites (8.2:1 dark, ~6.9:1 light). Everything is green — no fixes were needed.

**Phase 149 final verification report**

- Verified (no re-work needed): `#sync-progress` box wiring (single `setSyncLabel` writer with `running` flag; `is-running` class travels with the spin; aria-label owned by the writer), the panel/icon-only-button CSS, and the 5-test dedicated E2E; all 6 pre-existing sync E2Es' running pins migrated to the box, settled pins untouched.
- Dedicated E2E: `uv run pytest tests/e2e/test_sync_progress_box.py -v --no-cov` → **5 passed in 198.6 s** (isolation, slow-proxy mock; under the 600 s budget).
- Full suite: `uv run pytest --cov=app --cov-report=term-missing` → **3463 passed, app/ coverage 99%** (>90% gate).
- Migrated sync E2Es, each in isolation: `test_sync_button` 3 passed, `test_sync_cancel` 3, `test_sync_chunk_progress` 2, `test_sync_label_mobile` 4, `test_sync_summary_visibility` 3, `test_sync_upload_progress` 4 — all green.
- Lint/types: `uv run ruff check .` → All checks passed; `uv run pyright` → 0 errors.
- Criteria: in-flight spinner-only button + full untruncated wrapped box (desktop & mobile 390×844, `scrollWidth ≤ clientWidth`) ✓; settle byte-identical ("Synced HH:MM" + `3 added`, box hidden, aria restored) ✓; `#sync-result` sole live region (box `aria-hidden`), mid-run reload re-attaches ✓; WCAG (AA contrast both themes via the pinned ink-soft/surface pair, focus-visible, reduced-motion kill intact at styles.css L2201) ✓; cancel/409/error/upload/status API unchanged (green suites above) ✓.
- Documentation: README.md reviewed in full (sync-states paragraph now matches the shipped UI; env-var table matches `app/config.py` and covers all `.env.example` vars; pages/commands verified) and AGENTS.md reviewed in full — **verified consistent, no changes needed**.
- Notable: no defects found in this or prior work; no live infrastructure touched.
- Next pending phase: none — `todo/` will be empty once the harness moves 149 (only 149 was pending).

frontend/assets/sources.js

@@ -361,6 +361,31 @@
  * "Sync cancelled", never a stuck running state). The bor:sync-status
  * event shape is unchanged — the cancelled status object flows through
  * emitSyncStatus exactly like every other state.
+ *
+ * Phase 149 (task 01) — the sync detail box + the icon-only running
+ * button: the owner's report was that the full live label (a long
+ * source/relative/path + the counts + the chunk part) is clipped in
+ * the pill even on desktop — the mobile solution (stuffing the parts
+ * in the button) had become the permanent surface. The fix: while a
+ * sync/upload run is in flight, the button shows ONLY the spinning
+ * icon (the `is-running` class — task 02's CSS hides the label parts;
+ * the button IS the loading spinner, exactly the owner's ask), and a
+ * NEW bordered text box under the button row (#sync-progress, the
+ * presentational `aria-hidden` panel) shows the SAME full untruncated
+ * live label — wrapping, never clipped, breathing room. #sync-result
+ * REMAINS the sole aria-live announcer (one live region, no double
+ * announce — the box is a visual duplicate for sighted users). The
+ * wiring rides the SINGLE writer: setSyncLabel gains the `running`
+ * flag (true on the running entry — the poll ticks, the 202/409
+ * click, both re-attach entries; the settle default false) and writes
+ * the full label into the box + reveals/hides it, and owns the
+ * button's accessible name (full live label while running, the ship
+ * value "Sync sources" restored on every settle). The `is-running`
+ * class travels with the spin: added in enterSyncRunningState, removed
+ * in settleSyncButton (every terminal + both idles pass through it).
+ * The settle rendering ("Synced HH:MM" + the counts line), the Cancel
+ * control, the 409 double-trigger, the error banner/modal, and the
+ * sync status API are all UNCHANGED.
  */
 
 import { fetchIsAdmin } from "./header.js";
@@ -695,7 +720,11 @@ export async function mount(root) {
    * import phase after the file's first batch)), #sync-cancel-btn
    * (the Cancel control — phase 134 task 02, ship-hidden, revealed
    * only while a sync run is in flight), #sync-icon (the
-   * spinner icon), #sync-result (aria-live result line),
+   * spinner icon), #sync-result (aria-live result line — the SOLE
+   * live region), #sync-progress (Phase 149 task 01: the full
+   * untruncated live label's detail box under the button row —
+   * presentational, aria-hidden, visible only while a run is in
+   * flight; the .sync-progress-text span carries the label),
    * #sync-error-banner / #sync-error-text (error banner).
    */
   const syncBtn = root.querySelector("#sync-btn");
@@ -709,6 +738,15 @@ export async function mount(root) {
   const syncLabelCount = syncLabel ? syncLabel.querySelector(".sync-label-count") : null;
   const syncLabelChunk = syncLabel ? syncLabel.querySelector(".sync-label-chunk") : null;
   const syncIcon = syncBtn ? syncBtn.querySelector(".sync-icon") : null;
+  // Phase 149 (task 01): the sync detail box — the full UNTRUNCATED
+  // live label in a bordered panel under the button row, visible ONLY
+  // while a run is in flight (setSyncLabel reveals/hides it). The box
+  // is presentational (aria-hidden): #sync-result stays the SOLE
+  // aria-live announcer (one live region, no double announce).
+  const syncProgress = root.querySelector("#sync-progress");
+  const syncProgressText = syncProgress
+    ? syncProgress.querySelector(".sync-progress-text")
+    : null;
   const syncResult = root.querySelector("#sync-result");
   const syncErrorBanner = root.querySelector("#sync-error-banner");
   const syncErrorText = root.querySelector("#sync-error-text");
@@ -755,8 +793,20 @@ export async function mount(root) {
    * them are the CSS gap). textContent only — the house rule, no
    * HTML strings. Every label state goes through here (the running
    * builders, the idle / settle labels, the 202/409 click, the
-   * re-attach). */
-  function setSyncLabel(mainText, countText = "", chunkText = "") {
+   * re-attach).
+   * Phase 149 (task 01): the fourth parameter — `running` (the
+   * in-flight flag; the callsites are the ONLY decision sites: the
+   * running entry passes true, the settle passes the default false).
+   * The box (#sync-progress) gets the SAME untruncated `full` string
+   * (textContent only) and is visible IFF `running` — the detail box
+   * rides the writer, so it can never disagree with the button
+   * title / aria / the announcer. The button's accessible name rides
+   * here too: while running the icon-only button (task 02 hides the
+   * label parts) reads the FULL live label (the title already carries
+   * it for hover); every non-running call restores the ship value
+   * "Sync sources" (the static HTML attribute is the idle truth —
+   * the JS only overwrites/restores it, never removes it). */
+  function setSyncLabel(mainText, countText = "", chunkText = "", running = false) {
     if (syncLabelMain) syncLabelMain.textContent = mainText;
     if (syncLabelCount) {
       if (countText) {
@@ -782,6 +832,15 @@ export async function mount(root) {
       (chunkText ? ` ${chunkText}` : "");
     if (syncBtn) syncBtn.title = full; // A4: the untruncated label rides the title, always
     if (syncResult) syncResult.textContent = full; // A4: the announcer hears the whole thing
+    // Phase 149 (task 01): the detail box — the SAME untruncated label
+    // (one source, two surfaces: sighted users read the box, the
+    // announcer hears it), visible only while a run is in flight.
+    if (syncProgressText) syncProgressText.textContent = full;
+    if (syncProgress) syncProgress.hidden = !running;
+    // The running button is the spinner (task 02 hides the label
+    // parts) — its accessible name is the full live label; every
+    // settle restores the ship value (see the function docstring).
+    if (syncBtn) syncBtn.setAttribute("aria-label", running ? full : "Sync sources");
   }
 
   /* Phase 64 (task 04) + Phase 128 (task 01, the PARTS rework): the
@@ -894,7 +953,13 @@ export async function mount(root) {
    * same way (absent from the bare builders — the upload job and the
    * 202/409 click — so the "" default keeps the part hidden there).
    * Same never-stale mechanics as before (disabled, aria-busy,
-   * spinning icon, no is-error).
+   * spinning icon, no is-error). Phase 149 (task 01): the writer call
+   * passes `running = true` — the detail box reveals with the full
+   * label, and the button's accessible name becomes the full live
+   * label (the icon-only running button keeps a name; the writer
+   * owns the aria write, the entry no longer sets it) — plus the
+   * `is-running` class, which travels with the spin (task 02's CSS
+   * makes the running button icon-only).
    */
   function enterSyncRunningState(kind, currentFile, done, total, status) {
     if (!syncBtn) return;
@@ -904,10 +969,15 @@ export async function mount(root) {
       kind === "sync" && status
         ? fmtSyncPhaseLabel(status)
         : fmtSyncLabel(kind, currentFile, done, total);
-    setSyncLabel(main, count, chunk); // the parts + the A4 untruncated title / announcer
-    syncBtn.setAttribute("aria-label", "Sync sources");
+    // the parts + the A4 untruncated title / announcer + the phase-149
+    // detail box (revealed, full label) + the running aria-label
+    setSyncLabel(main, count, chunk, true);
     syncBtn.classList.remove("is-error");
     if (syncIcon) syncIcon.classList.add("is-spinning");
+    // Phase 149 (task 01): the icon-only running button — the class
+    // and the spin travel together (one in-flight state; the settle
+    // removes both).
+    syncBtn.classList.add("is-running");
     // Phase 134 (task 02): the Cancel control is visible + enabled
     // ONLY while a SYNC run is in flight — the upload job is NOT
     // cancellable in this phase (its run keeps the control hidden).
@@ -927,10 +997,17 @@ export async function mount(root) {
     syncBtn.setAttribute("aria-label", "Sync sources");
     syncBtn.classList.remove("is-error");
     if (syncIcon) syncIcon.classList.remove("is-spinning");
+    // Phase 149 (task 01): the class travels with the spin — EVERY
+    // settle (every terminal + both idles pass through here) leaves
+    // the running state.
+    syncBtn.classList.remove("is-running");
     // Phase 128 (task 01): the idle / settle labels ("Sync sources",
     // "Synced HH:MM") go through the parts writer — count hidden
     // (absent), the label's full string rides the title + #sync-result
-    // (A4, as with every label state).
+    // (A4, as with every label state). Phase 149 (task 01): the
+    // default `running = false` keeps the detail box hidden in every
+    // non-running state (idle, settled, error) and re-restores the
+    // button's idle accessible name.
     setSyncLabel(label);
   }