fix: recover desktop actions after daemon shutdown

[ChiragArora31]

Summary

Fixes #2242.

The desktop UI could stay open after its Electron-managed daemon had stopped. In that state, project actions like creating a task or spawning an orchestrator still looked available, but they could only fail after the user clicked them.

This change makes that stopped-daemon state explicit in the UI and gives users a direct recovery path.

What changed

• Disable task creation and orchestrator launch actions while the daemon is not ready.
• Add a Restart daemon action that uses the existing Electron daemon IPC path.
• Show spawn and restart failures inline instead of letting the action fail silently.
• Keep the board integration test wired through the same shell daemon-status context used by the app.

Verification

• npm --prefix frontend run test -- --run src/renderer/components/SessionsBoard.test.tsx src/renderer/__tests__/integration/pr-hydration.test.tsx src/renderer/components/ShellTopbar.test.tsx
• npm --prefix frontend run typecheck