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.

lib/locales/en.json

@@ -891,5 +891,45 @@
       "message": "Sorry! This feature is reserved for advanced members. You must have a higher subscription or the advanced AI activation option.",
       "close": "Close"
     }
+  },
+  "offline": {
+    "mode": {
+      "title": "Offline Mode",
+      "backToOnline": "Back to online login"
+    },
+    "pin": {
+      "setup": {
+        "title": "Configure PIN",
+        "titleFirstLogin": "Secure your offline access",
+        "subtitle": "Protect your local data",
+        "description": "This PIN will allow you to access your works even without an internet connection",
+        "pinLabel": "PIN Code (4-8 digits)",
+        "confirmPinLabel": "Confirm PIN",
+        "laterButton": "Later",
+        "configureButton": "Configure PIN",
+        "configuringButton": "Configuring...",
+        "footer": "Your PIN is stored securely on your device"
+      },
+      "verify": {
+        "title": "Offline Mode",
+        "subtitle": "Enter your PIN to access your local works",
+        "placeholder": "Enter your PIN",
+        "enterPin": "Please enter your PIN",
+        "incorrect": "Incorrect PIN",
+        "tooManyAttempts": "Too many failed attempts. Please reconnect online.",
+        "error": "Error verifying PIN",
+        "cancelButton": "Cancel",
+        "unlockButton": "Unlock",
+        "verifyingButton": "Verifying...",
+        "attemptsRemaining": "{{count}} attempt(s) remaining"
+      },
+      "errors": {
+        "tooShort": "PIN must be at least 4 digits",
+        "tooLong": "PIN cannot exceed 8 digits",
+        "digitsOnly": "PIN must contain only digits",
+        "mismatch": "PINs do not match",
+        "setupFailed": "Error configuring PIN"
+      }
+    }
   }
 }