Release exp: keyboard/screen-reader access for conversation actions menu (#6019). Thanks @sheldon-im.

ARIA (aria-expanded/controls, role=menu/menuitem) + focus-to-first-action on open +
Arrow/Home/End/Escape nav + focus-restore-to-trigger on close; existing click/touch unchanged.
Codex SAFE (isConnected-guarded restore, menu-scoped bounded arrow-nav, no listener leak
[25-cycle probe], 49 tests) + stream-gate GREEN.

CHANGELOG.md

@@ -13,6 +13,8 @@
 
 - **Deep-link straight to a profile with `?profile=<name>`.** Opening the WebUI with a `?profile=NAME` query parameter now switches to that profile on boot. The name is validated against the existing profile allowlist (a nonexistent profile boots normally, path-traversal / cross-profile attempts are rejected), the switch goes through the same access-enforced `switchToProfile`, and boot fails safe on anything invalid. Thanks @rodboev. (#5730, #5682)
 
+- **Conversation actions menu is now keyboard- and screen-reader-accessible.** The per-conversation actions popup (the ⋯ menu in the sidebar) now exposes proper ARIA (`aria-expanded`/`aria-controls` on the trigger, `role=menu`/`menuitem` on the items), moves focus to the first action when opened, supports Arrow/Home/End navigation and Escape-to-close, and restores focus to the originating trigger on close. The existing click/touch behavior is unchanged. Thanks @sheldon-im. (#6019)
+
 - **Model picker no longer duplicates or drops proxy/catalog models.** When the same model was reachable via both a custom proxy and a first-party catalog (e.g. `grok-4.5`), the picker could show it twice; the dedup fix collapses true duplicates to one selectable row while keeping genuinely-distinct models that merely share a name suffix — including colon-suffixed proxy models like `…:free` / `…:thinking` / `…:latest` — independently selectable. The currently-selected model always survives dedup, and model restore no longer substitutes a suffix-sharing sibling for a missing model. Thanks @rodboev. (#5997, #5989)
 
 - **Simplified Chinese (zh-CN) localization fill.** Untranslated English strings in the zh-CN locale are now translated, so Simplified Chinese users no longer see English fall-through text across recently-added UI. Thanks @Loukky. (#6024)