Introduces a new maintenance mode feature to allow administrators to temporarily disable the application for updates or maintenance.
This includes:
- A dedicated `MaintenancePage` component.
- Global state management for maintenance mode and message in `App.tsx`.
- Firestore integration for storing and retrieving maintenance settings.
- Updates to `AdminDashboard.tsx` to manage these settings.
- Firebase security rules adjustments for the new settings collection.
- Animate transitions for signal results in `SignalHistory.tsx`.
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