feat(app): Activity screen - the command queue on mobile

Settings → Manage → Activity lists every control command with status
filter chips, when/where it ran (project, agent, claiming worker or
'unclaimed'), and tap-to-expand result/error text; a Sweep CI button
enqueues the global poll. The list auto-refreshes every 5s while open,
so a login_start or spawn can be watched to completion — this was the
one web dashboard page missing from the phone, and exactly the view
needed to diagnose a stuck command.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01731mKtVzsfeT4Vi3TvkR48

app/App.tsx

@@ -41,6 +41,7 @@ import { PermissionsScreen } from "./src/screens/manage/PermissionsScreen";
 import { RepositoriesScreen } from "./src/screens/manage/RepositoriesScreen";
 import { GitServersScreen } from "./src/screens/manage/GitServersScreen";
 import { ApprovalsScreen } from "./src/screens/manage/ApprovalsScreen";
+import { ActivityScreen } from "./src/screens/manage/ActivityScreen";
 import { SharedContextScreen } from "./src/screens/manage/SharedContextScreen";
 import { UsersScreen } from "./src/screens/manage/UsersScreen";
 import { AccountScreen } from "./src/screens/manage/AccountScreen";
@@ -78,6 +79,7 @@ function Router() {
     repositories: RepositoriesScreen,
     gitServers: GitServersScreen,
     approvals: ApprovalsScreen,
+    activity: ActivityScreen,
     shared: SharedContextScreen,
     users: UsersScreen,
     account: AccountScreen,