Claude Code engine, image viewer, colour tags, checks per turn and more

- Claude Code as an engine: chats on a "claude-code/<alias>" model run through
  the claude CLI (stream-json); tool approvals go through our permission
  system. Sign in from the web UI (URL + pasted code), CLI version and update
  from Settings; the Docker image contains the CLI.
- Small models (8k context) for side tasks: input is cut to the model's
  context window; one-line chat status, "What does this do?" on approvals,
  "Plan as automation" (job draft from a chat).
- Mobile: top bar no longer widens the page, image viewer (zoom, swipe, mark
  up, use in message), jump to previous own message, message menu, time under
  every message.
- Approvals: push actions (allow/reject), "always allow in this project"
  (never for dangerous commands) with revoke.
- Per turn: changed files with diffs and rollback; project check command with
  a green/red badge and "let the agent fix it".
- Colour tags for chats in the colours of the active theme.
- Project defaults for new chats, project page (timeline), offline queue.

Tested in a throwaway container with a mock model (8k small model): 26 API
checks passed (permissions, diffs, checks, defaults, job draft, side-task
budget, Claude Code status/login URL, unsigned-in chat).

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

web/src/i18n/index.ts

@@ -72,6 +72,13 @@ export function fmtCompact(n: number) {
   return new Intl.NumberFormat(current, { notation: "compact", maximumFractionDigits: 1 }).format(n);
 }
 
+/** Short date and time of a message: only the time for today. */
+export function fmtMsgTime(ms: number) {
+  const d = new Date(ms);
+  const today = d.toDateString() === new Date().toDateString();
+  return new Intl.DateTimeFormat(current, today ? { timeStyle: "short" } : { dateStyle: "short", timeStyle: "short" }).format(d);
+}
+
 export function fmtCost(n: number, currency: string) {
   const digits = n !== 0 && Math.abs(n) < 1 ? 4 : 2;
   try {