Add offline mode support with PIN configuration and management

- Introduce `OfflinePinSetup` component for users to configure secure offline access.
- Add new `AIUsageContext` and extend `OfflineProvider` for offline-related state management.
- Implement offline login functionality in `electron/main.ts` with PIN verification and fallback support.
- Enhance IPC handlers to manage offline mode data, PIN setup, and synchronization.
- Update localization files (`en.json`, `fr.json`) with offline mode and PIN-related strings.
- Add `bcrypt` and `@types/bcrypt` dependencies for secure PIN hashing and validation.
- Refactor login and session management to handle offline mode scenarios with improved error handling and flow.

context/AlertContext.ts

@@ -0,0 +1,4 @@
+// This file is kept for backwards compatibility
+// It now re-exports from the new AlertProvider system
+export {AlertContext, AlertProvider} from './AlertProvider';
+export type {AlertContextProps} from './AlertProvider';