fix(ui): give the mobile refresh controls labels and full width

At <=640px the RAG "Sync sources" pill and the History "Refresh"
pill squeezed down to tiny icon-only buttons — hard to discover and
tap on a phone. They are now full-width labeled pills:

- the RAG page-head row wraps so the Sync pill drops below the
  "Knowledge base" title at full width; the History page-head
  already wrapped the pill below its title block
- the Sync label's min(16rem, 40vw) cap lifts on mobile (min-width: 0
  engages the ellipsis) so the live-file text truncates against the
  full width instead of the 40vw cap
- the Refresh glyph joins its visible label (it stays hidden on
  desktop, where the label carries the pill)

This matches the established mobile full-width pill language (New
chat / Share / stale-ban Regenerate). The three unit tests that
pinned the old icon-only CSS are updated to pin the new behavior.

frontend/assets/styles.css

@@ -2259,8 +2259,8 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
 .history-refresh:hover { background: #f55a72; color: var(--bg); }
 .history-refresh:disabled { opacity: 0.6; cursor: wait; }
 /* The refresh glyph is hidden on desktop (the label carries the
-   pill); it is the whole control below 640px (the <=640 block
-   mirrors the phase-46 auth-link icon-only convention). */
+   pill); below 640px it joins the visible label in the full-width
+   pill (the <=640 block — the icon-only squeeze is gone). */
 .history-refresh svg { width: 16px; height: 16px; display: none; }
 
 /* ---------- History page (phase 50) ----------
@@ -3663,17 +3663,20 @@ details.thinking .thinking-text ul { margin: 0 0 0.5rem; }
   .shared-note { font-size: 0.88rem; }
   .footer-inner { flex-direction: column; gap: 0.2rem; text-align: center; }
   main { padding-bottom: env(safe-area-inset-bottom, 0); }
-  /* Sync button goes icon-only on mobile; the label hides, aria-label
-     keeps the accessible name. The spinning icon is the visible running
-     state on a touch screen. */
-  .sync-btn { padding: 0.4rem 0.3rem; }
-  .sync-label { display: none; }
-  /* Phase 77 task 03: the History refresh pill goes icon-only like
-     the phase-46 auth pill (the aria-label keeps the accessible
-     name); the page-head row above wraps the pill below the title
-     block when the width runs out. */
-  .history-refresh { padding: 0.4rem 0.3rem; }
-  .history-refresh-label { display: none; }
+  /* Sync + History refresh: full-width LABELED pills on mobile (the
+     icon-only squeeze is gone — a symbol-only control is too small a
+     target to discover on a phone). The RAG page-head row wraps so
+     the Sync pill drops below the "Knowledge base" title at full
+     width; the History page-head already wraps the pill below its
+     title block. The Sync label's min(16rem, 40vw) cap lifts so the
+     live-file text ellipsizes against the FULL width (min-width: 0
+     lets the nowrap flex item shrink, which is what engages the
+     ellipsis); the refresh glyph joins its visible label. The
+     aria-labels keep the accessible names. */
+  .page-head-row { flex-wrap: wrap; }
+  .sync-btn { width: 100%; }
+  .sync-label { max-width: none; min-width: 0; }
+  .history-refresh { width: 100%; }
   .history-refresh svg { display: block; }
   .sync-result {
     position: absolute !important;

frontend/index.html

@@ -691,9 +691,10 @@
                page-head — OUTSIDE the table wrap — so it stays
                reachable while the empty state is showing. The house
                inline-SVG refresh glyph (aria-hidden) + the visible
-               "Refresh" label (the phase-46 auth-link convention:
-               label visible >=640px, icon-only below; the aria-label
-               keeps the accessible name in both). history.js binds it
+               "Refresh" label (visible at every width — below 640px
+               the pill goes full width and the glyph joins the
+               label; the aria-label keeps the accessible name in
+               both). history.js binds it
                in the admin branch (the view is admin-gated; anonymous
                sees the gate instead) and announces the outcome in
                #history-status. -->