- Add green "Update app" / "Restart to update" button in header (TabBarActions)
- Enhance UpdateDialog: larger, dynamic buttons, scrollable release notes,
version badge, "View on GitHub" link
- Add DashboardUpdateBanner: compact dismissible banner keyed by version
- Add periodic hourly update checks in UpdaterService with unref() timer
- Add dismissed version tracking in updateSlice (localStorage persistence)
- Add state transition guards in store listener: prevent periodic re-checks
from resetting downloading/downloaded status back to available/checking
- Guard error events from overriding downloaded state (transient check failures)
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