feat(ui): git status indicator in the bottom bar, with a panel of uncommitted and unpushed work

Optional and per-device (showGitStatus, default off). GET /api/sessions/:id/git-status is
read-only and offline (no fetch, --no-optional-locks), skips remote and Docker sessions, caps its
lists, and single-flights concurrent polls. The toolbar indicator shows uncommitted files,
commits not pushed, or a check; clicking opens a draggable panel in the style of the Files window.

Which repositories: the enclosing one when there is one; otherwise every repository up to two
levels below the working directory (capped, skipping dot-folders and node_modules, never
following symlinks), each in a collapsible section, with the indicator summing them. A repository
that merely sits above the workspace and is the home folder or higher (a dotfiles repo) is
ignored. Git-supplied text is only ever written with textContent.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JrzFKEdBLwVfu6ev2ZscJS

src/web/routes/git-status-routes.ts

@@ -0,0 +1,33 @@
+/**
+ * @fileoverview `GET /api/sessions/:id/git-status`: what the session's workspace has not committed or
+ * pushed (src/git-workspace-status.ts), for the bottom-bar Git indicator and its panel. The answer is
+ * an overview: the enclosing repository, or each repository found below a folder that holds several
+ * projects (see `getGitWorkspaceOverview` for exactly which).
+ *
+ * Read-only and offline: it never fetches and never runs a git write command. A remote (SSH) or
+ * Docker session is not inspected and answers `state: 'unsupported'`: a Docker workspace is writable
+ * from inside the sandbox, and git here would run on the host. Ownership goes through
+ * `findSessionOrFail`, like every session-scoped route.
+ */
+
+import type { FastifyInstance } from 'fastify';
+import type { ApiResponse } from '../../types.js';
+import { findSessionOrFail } from '../route-helpers.js';
+import {
+  emptyOverview,
+  getGitWorkspaceOverview,
+  type GitRunner,
+  type GitWorkspaceOverview,
+} from '../../git-workspace-status.js';
+import type { SessionPort } from '../ports/index.js';
+
+export function registerGitStatusRoutes(app: FastifyInstance, ctx: SessionPort, git?: GitRunner): void {
+  app.get('/api/sessions/:id/git-status', async (req): Promise<ApiResponse<GitWorkspaceOverview>> => {
+    const { id } = req.params as { id: string };
+    const { fresh } = req.query as { fresh?: string };
+    const session = findSessionOrFail(ctx, id, req);
+    if (session.remote) return { success: true, data: emptyOverview('unsupported', { reason: 'remote' }) };
+    if (session.docker) return { success: true, data: emptyOverview('unsupported', { reason: 'docker' }) };
+    return { success: true, data: await getGitWorkspaceOverview(session.workingDir, { git, fresh: fresh === '1' }) };
+  });
+}