The sidebar `messages` namespace was missing six keys that are referenced
in `useSidebarController.ts`:
- messages.updateProjectError (rename / star-toggle failure)
- messages.refreshError (project list refresh failure)
- messages.restoreProjectFailed / restoreProjectError
- messages.restoreSessionFailed / restoreSessionError
`updateProjectError` and `refreshError` are called via `t()` without an
inline default, so on failure users see the raw key string
"messages.updateProjectError" / "messages.refreshError" instead of a
message. The four restore.* keys have inline English defaults in the code,
so they previously fell back to English even in non-English UIs.
Adds all six keys to every locale (de, en, fr, it, ja, ko, ru, tr,
zh-CN, zh-TW), matching the existing wording/style of the neighbouring
delete/create messages in each file.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Users can miss chat completions while the app is in the background.
They can also miss completions when their attention is elsewhere.
Add opt-out sound notifications and a temporary title marker.
This makes completion noticeable without external audio assets or persistent browser notifications.
