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/whatsnew.ts

@@ -3,6 +3,16 @@
  * under "unreleased"; scripts/release.sh renames the key to the release version.
  */
 export const WHATS_NEW: Record<string, { en: string[]; de: string[] }> = {
+  unreleased: {
+    en: [
+      "Claude Code as an engine: sign in under Settings → Account, then pick a “Claude Code” model",
+      "Image viewer, message menu, colour tags for chats, approvals from push notifications, check after each turn, project page",
+    ],
+    de: [
+      "Claude Code als Engine: unter Einstellungen → Konto anmelden, dann ein „Claude Code“-Modell wählen",
+      "Bildbetrachter, Nachrichtenmenü, Farben für Chats, Freigaben per Push, Prüfung nach jedem Schritt, Projektseite",
+    ],
+  },
   "202611-00024": {
     en: ["3D models with fal.ai: from an image (also pasted into the chat), a text prompt or both – open them in the 3D view"],
     de: ["3D-Modelle mit fal.ai: aus einem Bild (auch eingefügt), einem Text oder beidem – öffnen in der 3D-Ansicht"],