feat: Improve biometrics message and face unlock

lib/l10n/app_en.arb

@@ -856,11 +856,13 @@
   "@scanBiometricHint": {},
   "scanLibrary": "Scan library",
   "@scanLibrary": {},
-  "scanYourFingerprintToAuthenticate": "Scan your fingerprint to authenticate {user}",
-  "@scanYourFingerprintToAuthenticate": {
+  "authenticateWithBiometrics": "Use biometrics to authenticate {user}",
+  "@authenticateWithBiometrics": {
+    "description": "Prompt shown to the user when biometric authentication is requested",
     "placeholders": {
       "user": {
-        "type": "String"
+        "type": "String",
+        "example": "Jane"
       }
     }
   },

lib/screens/shared/authenticate_button_options.dart

@@ -34,7 +34,11 @@ Future<void> showAuthOptionsDialogue(
                       setMethod.call(currentUser.copyWith(authMethod: method));
                       break;
                     case Authentication.biometrics:
-                      final authenticated = await AuthService.authenticateUser(context, currentUser);
+                      final authenticated = await AuthService.authenticateUser(
+                        context,
+                        currentUser,
+                        sensitiveTransaction: true,
+                      );
                       if (authenticated) {
                         setMethod.call(currentUser.copyWith(authMethod: method));
                       } else if (context.mounted) {

lib/util/auth_service.dart

@@ -1,5 +1,7 @@
 // ignore_for_file: depend_on_referenced_packages
 
+import 'dart:developer';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
@@ -11,15 +13,21 @@ import 'package:fladder/models/account_model.dart';
 import 'package:fladder/util/localization_helper.dart';
 
 class AuthService {
-  static Future<bool> authenticateUser(BuildContext context, AccountModel user) async {
+  static Future<bool> authenticateUser(
+    BuildContext context,
+    AccountModel user, {
+    bool stickyAuth = true,
+    bool sensitiveTransaction = false,
+  }) async {
     final LocalAuthentication localAuthentication = LocalAuthentication();
     bool isAuthenticated = false;
     bool isBiometricSupported = await localAuthentication.isDeviceSupported();
+
     if (isBiometricSupported) {
       try {
         isAuthenticated = await localAuthentication.authenticate(
           localizedReason:
-              context.localized.scanYourFingerprintToAuthenticate("(${user.name} - ${user.credentials.serverName})"),
+              context.localized.authenticateWithBiometrics("(${user.name} - ${user.credentials.serverName})"),
           authMessages: <AuthMessages>[
             AndroidAuthMessages(
               signInTitle: 'Fladder',
@@ -29,8 +37,17 @@ class AuthService {
               cancelButton: context.localized.cancel,
             )
           ],
+          options: AuthenticationOptions(
+            stickyAuth: stickyAuth,
+            sensitiveTransaction: sensitiveTransaction,
+          ),
         );
-      } on PlatformException catch (_) {}
+      } on PlatformException catch (e) {
+        debugPrint('Error during authentication: $e');
+      }
+    } else {
+      log('Biometric authentication is not supported on this device.');
+      return false;
     }
     return isAuthenticated;
   }