Post-1.3: tray actions should reflect service-down state

[ebursztein]

Manual 1.3 testing: capsem status showed the service stopped, but the tray still offered actions like dashboard/session listing that cannot work while the daemon is down.

Expected:

• When service is down, tray should clearly show service unavailable.
• Actions that require the daemon should be disabled or replaced with Start/Retry.
• No dashboard/session action should lead to confusing API errors when the service is known down.

Post-1.3 polish unless it blocks service start.