feat: Add document download and upload. Add NFC support and enhance attendance and permits views

- Improved error message handling in LoginScreen for invalid credentials.
- Added new images: mariani-icon.png and mariani-splash.png.
- Updated AddDocumentModal to handle file extensions and improve UI.
- Enhanced CalendarWidget to support month change callbacks.
- Introduced NfcScanModal for NFC tag scanning with animations.
- Revamped QrScanModal to utilize camera for QR code scanning.
- Removed mock data from data.ts and streamlined Office data.
- Updated package dependencies for expo-camera and react-native-nfc-manager.
- Added utility function to parse seconds to time format.
- Refactored document upload logic to use FormData for server uploads.

app/login.tsx

@@ -45,7 +45,8 @@ export default function LoginScreen() {
             if (error.response) {
                 // Errore dal server (es. 401 Credenziali errate)
                 if (error.response.status === 401) {
-                    message = "Credenziali non valide.";
+                    // TODO: Alert o Toast specifico per credenziali errate
+                    message = "Credenziali non valide."
                 } else {
                     message = `Errore Server: ${error.response.data.message || error.response.status}`;
                 }