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>

CHANGELOG.md

@@ -3,6 +3,34 @@
 All notable changes to CodeCraft. Versions follow [Semantic Versioning](https://semver.org/);
 until 1.0, minor versions may contain breaking changes.
 
+## [Unreleased]
+
+### Added
+
+- **Claude Code as an engine:** chats with a "Claude Code" model (Opus, Sonnet, Haiku, default) are
+  run by the `claude` CLI. Its events become normal chat messages; its tool approvals go through
+  CodeCraft's permission system (cards, push buttons, "allow for this project", diffs, sandbox).
+  Sign in from the web UI (Settings → Account → Claude Code: open the sign-in URL, paste the code),
+  see the CLI version and install updates (admins; installed into the persistent home). The Docker
+  image now contains the CLI.
+- **Small models (8k context) for side tasks:** `small_model` jobs cut their input to the model's
+  context window. New with it: a one-line status per chat in the session list, "What does this
+  do?" on approvals, and "Plan as automation" (drafts job instructions from a chat).
+- **Mobile:** the top bar no longer pushes the page sideways (extra actions moved into the ⋯ menu);
+  an image viewer for all images (zoom, swipe between images, mark up and attach to the message,
+  use in the message); jump to the previous own message; message menu (copy, quote, fork from
+  here, edit and resend); date and time under every message.
+- **Approvals:** push notifications can allow or reject right away; "always allow in this project"
+  is remembered per folder (never for dangerous commands) and can be revoked in the ⋯ menu.
+- **Changes per turn:** files changed by a turn with diffs and "roll back to before this turn".
+- **Check after each turn:** a command per project (e.g. `cargo test`) runs after turns that
+  changed files; green/red badge with output and "let the agent fix it".
+- **Colour tags for chats:** tinted chat background and a badge in the list, drawn in the colours
+  of the active theme.
+- **Project defaults, project page, offline queue:** new chats in a folder inherit model, mode,
+  colour, instructions and folder; a timeline of a project's chats (sidebar → project → ⋯);
+  messages written without a connection are sent when it is back.
+
 ## [v202611-00025] – 2026-11-12
 
 ### Fixed