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/server.ts

@@ -183,6 +183,7 @@ import {
   registerApprovalRoutes,
   registerRebootRestoreRoutes,
   registerReadMyMindRoutes,
+  registerGitStatusRoutes,
   registerStatusTelemetryRoutes,
   registerSystemRoutes,
   registerCaseRoutes,
@@ -1121,6 +1122,7 @@ export class WebServer extends EventEmitter {
     registerApprovalRoutes(this.app, ctx);
     registerRebootRestoreRoutes(this.app, ctx);
     registerReadMyMindRoutes(this.app, ctx);
+    registerGitStatusRoutes(this.app, ctx);
     registerStatusTelemetryRoutes(this.app, ctx);
     registerSystemRoutes(this.app, ctx);
     registerCaseRoutes(this.app, ctx);