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/compose.ts

@@ -0,0 +1,20 @@
+/** Put content into the composer of a chat from anywhere in the app (quote, image viewer, …). */
+export interface ComposeDetail {
+  sessionId: string;
+  /** Appended to the text field (a blank line before it if there is text already). */
+  text?: string;
+  /** Attached like dropped files (images stay images). */
+  files?: File[];
+}
+
+export const COMPOSE_EVENT = "codecraft:compose";
+
+export function compose(detail: ComposeDetail) {
+  window.dispatchEvent(new CustomEvent<ComposeDetail>(COMPOSE_EVENT, { detail }));
+}
+
+/** "> quoted\n> lines\n\n" for the composer. */
+export function asQuote(text: string) {
+  const lines = text.trim().split("\n").map((l) => `> ${l}`.trimEnd());
+  return `${lines.join("\n")}\n\n`;
+}