The fifth area of the interface translation. The chat screen now builds its
text through t(): the header (the rename tooltip, the sidebar toggle, the
artifacts toggle, and the recall banner with its Cancel and Skip next
buttons), the list around it (the connection-lost banner and its Retry, and —
unreachable for now — the empty state), the input bar (the sending notice, the
paperclip, the placeholder, Send and Stop generation), the attachment strip
(its alt text and its remove button), the message list (Loading older
messages… and the scroll-to-bottom tooltip) and the queued-messages chip. Also
four toasts the WebSocket composable raises — background task started /
finished, MCP server connected / disconnected — and the compression notice's
own pending text.

26 new slugs in all three dictionaries:

- 20 in chat.* — the header and recall banner, the input bar, the attachment
  strip, the queued chip and the empty state;
- 4 in toast.* — the two background-task and the two MCP toasts;
- 2 in common.* — task and toolsCount.

Four details worth knowing:

- The recall banner used to read the server's call_type enum out loud
  ("Scheduled once recall at …"). The word is now a slug
  (chat.recallOnce / chat.recallRecurring / chat.recallImmediate), so it agrees
  with the sentence around it — Russian and Ukrainian both change the
  adjective's gender and the preposition, which a bare enum cannot.
- The banner's time was formatted with the browser's locale; it now formats
  against locale.value, so the date follows the interface language rather than
  the machine.
- The queued chip counted with `count === 1 ? '' : 's'`. It is now a dictionary
  plural driven by {n}, which is what Russian and Ukrainian need — "1
  сообщение", "2 сообщения", "5 сообщений".
- toolsCount moved from messages.* to common.*: the tool-count badge in the
  assistant message and the MCP-connected toast both render it, so the same
  word lives in the vocabulary area instead of twice under two areas.
  docs/i18n.md records the move.

The English values are verbatim the literals the code hard-coded, so the
English interface is unchanged and no test needed editing.

Checked live in Chromium against the built bundle on the dev backend, all
three languages: the header title, the input placeholder, both input-row
buttons, the recall banner and its buttons, twelve message rows and the
attachment's alt and remove — read fresh for each language by picking it in
Settings first — with a scan of the page's text, titles, aria-labels, alt texts
and placeholders for a slug that leaked into the interface as the pass
condition.

Two states a saved session cannot be put into are covered by a throwaway mount
instead, and the file was removed again: the streaming input bar (Sending…,
Stop generation) and the queued chip, plus the recall words and the toast
titles, printed in Russian — "1 сообщение в очереди" / "2 сообщения" /
"5 сообщений".

The connection-lost banner never appears in this harness: with no socket token
the server refuses the socket and the client never exhausts its retries inside
the test's window, on the current build and on HEAD's alike. It is covered by
the existing tests/unit/composables/useWebSocket.test.js and by reading
ChatArea.vue; the same goes for chat.nothingOpen / chat.startConversation,
which App.vue's WelcomeScreen shadows before ChatArea can render its own empty
state — the branch is dead today and keeps its slugs for when it is not.