docs(convoys): fix Brief 3 TopSearchBar UserMenu elevation token

Self-review recheck against current TopSearchBar.js (L211-222) found
that the UserMenu dropdown uses var(--elevation-pronounced), not
var(--elevation-ambient) as Brief 3's initial sample showed. Brief 3
now documents the verbatim shape (pronounced + role="menu" +
aria-label + overflow-hidden) and the convoy's risk-list note is
updated to reflect all three popovers' verbatim chains.

No semantic change to the plan; just an accuracy fix the
implementer of Brief 3 needs to ship the right code on the first try.

Co-authored-by: Cursor <cursoragent@cursor.com>

.convoys/unify-glass-panel-surfaces.md

@@ -616,11 +616,15 @@ Read-only verification against the post-PR-#117 + post-PR-#118 tree.
      ships `var(--rim-light-inner), var(--ember-rim-subtle),
      var(--elevation-ambient)`; the mobile drawer ships
      `var(--rim-light-inner), var(--rim-light-outer),
-     var(--elevation-pronounced)`. Both are preserved as inline
+     var(--elevation-pronounced)`; the TopSearchBar UserMenu dropdown
+     ships `var(--rim-light-inner), var(--ember-rim-subtle),
+     var(--elevation-pronounced)` (verified during boot-the-brief
+     recheck — uses `-pronounced`, not `-ambient`, because it floats
+     higher in the viewport). All three are preserved as inline
      `style={{ boxShadow: '...' }}` overrides on the
      `.glass-panel-strong` element (the class's default
      `var(--rim-light-inner), var(--elevation-ambient)` would otherwise
-     lose the ember-rim and the pronounced elevation). Brief 3
+     lose the ember-rim and either heavier elevation). Brief 3
      documents the verbatim chain.
    - Brief 5's class deletion: the `.card` block in
      `styles/globals.css` is a single rule; deleting it is a clean

.convoys/unify-glass-panel-surfaces/brief-3-floating-popovers.md

@@ -97,32 +97,38 @@ Migrate three floating surfaces — the sidebar profile dropdown, the mobile dra
   ### C. TopSearchBar `<UserMenu>` dropdown panel
   ```jsx
   // Before — the absolutely-positioned <div> nested inside UserMenu,
-  // around L214-222 of TopSearchBar.js:
+  // around L211-222 of TopSearchBar.js (verified against current file
+  // 2026-06-04 during architect boot-the-brief recheck):
   <div
-    className="absolute right-0 top-full mt-2 w-56 rounded-xl py-2 z-50"
+    role="menu"
+    aria-label="Account menu"
+    className="absolute right-0 top-full mt-2 w-56 rounded-xl z-30 overflow-hidden"
     style={{
       background: 'var(--glass-surface-high)',
       backdropFilter: 'blur(var(--glass-blur-mid)) saturate(var(--glass-saturate))',
       WebkitBackdropFilter: 'blur(var(--glass-blur-mid)) saturate(var(--glass-saturate))',
-      boxShadow: 'var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-ambient)',
+      boxShadow:
+        'var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-pronounced)',
     }}
   >
 
   // After:
   <div
-    className="glass-panel-strong absolute right-0 top-full mt-2 w-56 rounded-xl py-2 z-50"
+    role="menu"
+    aria-label="Account menu"
+    className="glass-panel-strong absolute right-0 top-full mt-2 w-56 rounded-xl z-30 overflow-hidden"
     style={{
       boxShadow:
-        'var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-ambient)',
+        'var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-pronounced)',
     }}
   >
   ```
-  **NOTE:** confirm the verbatim shape of the current TopSearchBar
+  Note: this dropdown uses `--elevation-pronounced` (not `-ambient`)
-  UserMenu dropdown against L214-222 before editing — the inline
+  — it's a heavier shadow than the sidebar profile dropdown's because
-  className/style block might already have minor differences from the
+  it floats higher in the viewport over more content. Preserve that
-  "before" sample above (e.g. different `w-` width, different
+  verbatim; do not normalize to `-ambient`. The `role="menu"` +
-  `mt-` margin). Migrate the actual block, not this sample; the
+  `aria-label="Account menu"` + `overflow-hidden` attributes also stay
-  sample only shows the shape of the swap.
+  byte-identical.
 
 - **Preserve all children verbatim.** Menu items, dividers, icons,
   click handlers — all stay byte-identical.
@@ -141,7 +147,7 @@ Migrate three floating surfaces — the sidebar profile dropdown, the mobile dra
 
 - [ ] Sidebar profile dropdown panel uses `className="glass-panel-strong ..."` and carries an inline `boxShadow` with `var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-ambient)`.
 - [ ] Mobile drawer panel uses `className="glass-panel-strong ..."` and carries an inline `boxShadow` with `var(--rim-light-inner), var(--rim-light-outer), var(--elevation-pronounced)`.
-- [ ] TopSearchBar `<UserMenu>` dropdown panel uses `className="glass-panel-strong ..."` and carries an inline `boxShadow` with `var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-ambient)`.
+- [ ] TopSearchBar `<UserMenu>` dropdown panel uses `className="glass-panel-strong ..."` and carries an inline `boxShadow` with `var(--rim-light-inner), var(--ember-rim-subtle), var(--elevation-pronounced)`.
 - [ ] No inline `background: 'var(--glass-surface-*)'` or `backdropFilter` style remains on any of the three migrated `<div>`s.
 - [ ] Sidebar nav-chip block (Layout.js ~L858-861) UNCHANGED. TopSearchBar `<header>` block UNCHANGED. (Architect's allowlist for chrome-tier surfaces.)
 - [ ] `test/components/Layout.test.js` has at least 2 new assertions (sidebar dropdown + mobile drawer carry `glass-panel-strong`).