Merge pull request #34 from dougborg/pr/02-lint-cleanup

Add flutter_lints and fix all analyzer warnings

lib/app_state.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/material.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter_map/flutter_map.dart' show LatLngBounds;
 import 'package:http/http.dart' as http;
 import 'package:latlong2/latlong.dart';
@@ -23,7 +22,6 @@ import 'services/operator_profile_service.dart';
 import 'services/deep_link_service.dart';
 import 'widgets/node_provider_with_cache.dart';
 import 'services/profile_service.dart';
-import 'widgets/proximity_warning_dialog.dart';
 import 'widgets/reauth_messages_dialog.dart';
 import 'dev_config.dart';
 import 'state/auth_state.dart';
@@ -366,6 +364,7 @@ class AppState extends ChangeNotifier {
   /// Show re-authentication dialog if needed
   Future<void> checkAndPromptReauthForMessages(BuildContext context) async {
     if (await needsReauthForMessages()) {
+      if (!context.mounted) return;
       _showReauthDialog(context);
     }
   }

lib/migrations.dart

@@ -1,5 +1,4 @@
 import 'dart:convert';
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -147,7 +146,7 @@ class OneTimeMigrations {
       debugPrint('[Migration] Stack trace: $stackTrace');
       
       // Nuclear option: clear everything and show non-dismissible error dialog
-      if (context != null) {
+      if (context != null && context.mounted) {
         NuclearResetDialog.show(context, error, stackTrace);
       } else {
         // If no context available, just log and hope for the best

lib/models/direction_fov.dart

@@ -9,7 +9,7 @@ class DirectionFov {
   DirectionFov(this.centerDegrees, this.fovDegrees);
   
   @override
-  String toString() => 'DirectionFov(center: ${centerDegrees}°, fov: ${fovDegrees}°)';
+  String toString() => 'DirectionFov(center: $centerDegrees°, fov: $fovDegrees°)';
   
   @override
   bool operator ==(Object other) =>

lib/models/node_profile.dart

@@ -1,4 +1,3 @@
-import 'package:uuid/uuid.dart';
 import 'osm_node.dart';
 
 /// Sentinel value for copyWith methods to distinguish between null and not provided

lib/models/operator_profile.dart

@@ -1,4 +1,3 @@
-import 'package:uuid/uuid.dart';
 import 'osm_node.dart';
 
 /// A bundle of OSM tags that describe a particular surveillance operator.

lib/models/suspected_location.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'package:flutter/foundation.dart';
 import 'package:latlong2/latlong.dart';
 
 /// A suspected surveillance location from the CSV data
@@ -35,8 +36,8 @@ class SuspectedLocation {
         bounds = coordinates.bounds;
       } catch (e) {
         // If GeoJSON parsing fails, use default coordinates
-        print('[SuspectedLocation] Failed to parse GeoJSON for ticket $ticketNo: $e');
+        debugPrint('[SuspectedLocation] Failed to parse GeoJSON for ticket $ticketNo: $e');
-        print('[SuspectedLocation] Location string: $locationString');
+        debugPrint('[SuspectedLocation] Location string: $locationString');
       }
     }
 
@@ -60,7 +61,7 @@ class SuspectedLocation {
       // The geoJson IS the geometry object (not wrapped in a 'geometry' property)
       final coordinates = geoJson['coordinates'] as List?;
       if (coordinates == null || coordinates.isEmpty) {
-        print('[SuspectedLocation] No coordinates found in GeoJSON');
+        debugPrint('[SuspectedLocation] No coordinates found in GeoJSON');
         return (centroid: const LatLng(0, 0), bounds: <LatLng>[]);
       }
 
@@ -109,7 +110,7 @@ class SuspectedLocation {
           }
           break;
         default:
-          print('Unsupported geometry type: $type');
+          debugPrint('Unsupported geometry type: $type');
       }
 
       if (points.isEmpty) {
@@ -127,7 +128,7 @@ class SuspectedLocation {
 
       return (centroid: centroid, bounds: points);
     } catch (e) {
-      print('Error extracting coordinates from GeoJSON: $e');
+      debugPrint('Error extracting coordinates from GeoJSON: $e');
       return (centroid: const LatLng(0, 0), bounds: <LatLng>[]);
     }
   }

lib/screens/advanced_settings_screen.dart

@@ -3,7 +3,6 @@ import 'settings/sections/max_nodes_section.dart';
 import 'settings/sections/proximity_alerts_section.dart';
 import 'settings/sections/suspected_locations_section.dart';
 import 'settings/sections/tile_provider_section.dart';
-import 'settings/sections/network_status_section.dart';
 import '../services/localization_service.dart';
 
 class AdvancedSettingsScreen extends StatelessWidget {

lib/screens/coordinators/sheet_coordinator.dart

@@ -9,7 +9,6 @@ import '../../widgets/add_node_sheet.dart';
 import '../../widgets/edit_node_sheet.dart';
 import '../../widgets/navigation_sheet.dart';
 import '../../widgets/measured_sheet.dart';
-import '../../state/settings_state.dart' show FollowMeMode;
 
 /// Coordinates all bottom sheet operations including opening, closing, height tracking,
 /// and sheet-related validation logic.
@@ -118,9 +117,8 @@ class SheetCoordinator {
     controller.closed.then((_) {
       _addSheetHeight = 0.0;
       onStateChanged();
-      
+
       // Handle dismissal by canceling session if still active
-      final appState = context.read<AppState>();
       if (appState.session != null) {
         debugPrint('[SheetCoordinator] AddNodeSheet dismissed - canceling session');
         appState.cancelSession();
@@ -187,9 +185,8 @@ class SheetCoordinator {
       _editSheetHeight = 0.0;
       _transitioningToEdit = false;
       onStateChanged();
-      
+
       // Handle dismissal by canceling session if still active
-      final appState = context.read<AppState>();
       if (appState.editSession != null) {
         debugPrint('[SheetCoordinator] EditNodeSheet dismissed - canceling edit session');
         appState.cancelEditSession();
@@ -266,7 +263,7 @@ class SheetCoordinator {
   /// Restore the follow-me mode that was active before opening a node sheet
   void _restoreFollowMeMode(AppState appState) {
     if (_followMeModeBeforeSheet != null) {
-      debugPrint('[SheetCoordinator] Restoring follow-me mode: ${_followMeModeBeforeSheet}');
+      debugPrint('[SheetCoordinator] Restoring follow-me mode: $_followMeModeBeforeSheet');
       appState.setFollowMeMode(_followMeModeBeforeSheet!);
       _followMeModeBeforeSheet = null; // Clear stored state
     }

lib/screens/home_screen.dart

@@ -1,8 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_animations/flutter_map_animations.dart';
 import 'package:flutter_svg/flutter_svg.dart';
-import 'package:latlong2/latlong.dart';
 import 'package:provider/provider.dart';
 
 import '../app_state.dart';
@@ -10,12 +8,9 @@ import '../dev_config.dart';
 import '../widgets/map_view.dart';
 import '../services/localization_service.dart';
 
-import '../widgets/add_node_sheet.dart';
-import '../widgets/edit_node_sheet.dart';
 import '../widgets/node_tag_sheet.dart';
 import '../widgets/download_area_dialog.dart';
 import '../widgets/measured_sheet.dart';
-import '../widgets/navigation_sheet.dart';
 import '../widgets/search_bar.dart';
 import '../widgets/suspected_location_sheet.dart';
 import '../widgets/welcome_dialog.dart';
@@ -190,6 +185,7 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
       
       // Run any needed migrations first
       final versionsNeedingMigration = await ChangelogService().getVersionsNeedingMigration();
+      if (!mounted) return;
       for (final version in versionsNeedingMigration) {
         await ChangelogService().runMigration(version, appState, context);
       }
@@ -214,6 +210,7 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
         
         case PopupType.changelog:
           final changelogContent = await ChangelogService().getChangelogContentForDisplay();
+          if (!mounted) return;
           if (changelogContent != null) {
             await showDialog(
               context: context,
@@ -252,35 +249,6 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
     );
   }
   
-  void _zoomAndCenterForRoute(bool followMeEnabled, LatLng? userLocation, LatLng? routeStart) {
-    try {
-      LatLng centerLocation;
-      
-      if (followMeEnabled && userLocation != null) {
-        // Center on user if follow-me is enabled
-        centerLocation = userLocation;
-        debugPrint('[HomeScreen] Centering on user location for route start');
-      } else if (routeStart != null) {
-        // Center on start pin if user is far away or no GPS
-        centerLocation = routeStart;
-        debugPrint('[HomeScreen] Centering on route start pin');
-      } else {
-        debugPrint('[HomeScreen] No valid location to center on');
-        return;
-      }
-      
-      // Animate to zoom 14 and center location
-      _mapController.animateTo(
-        dest: centerLocation,
-        zoom: 14.0,
-        duration: const Duration(milliseconds: 800),
-        curve: Curves.easeInOut,
-      );
-    } catch (e) {
-      debugPrint('[HomeScreen] Could not zoom/center for route: $e');
-    }
-  }
-  
   void _onResumeRoute() {
     _navigationCoordinator.resumeRoute(
       context: context,
@@ -402,9 +370,11 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
     );
     
     // Reset height and clear selection when sheet is dismissed
+    final appState = context.read<AppState>();
     controller.closed.then((_) {
+      if (!mounted) return;
       _sheetCoordinator.resetTagSheetHeight(() => setState(() {}));
-      context.read<AppState>().clearSuspectedLocationSelection();
+      appState.clearSuspectedLocationSelection();
     });
   }
 
@@ -578,7 +548,7 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
                           borderRadius: BorderRadius.circular(16),
                           boxShadow: [
                             BoxShadow(
-                              color: Theme.of(context).shadowColor.withOpacity(0.3),
+                              color: Theme.of(context).shadowColor.withValues(alpha: 0.3),
                               blurRadius: 10,
                               offset: Offset(0, -2),
                             )

lib/screens/navigation_settings_screen.dart

@@ -132,7 +132,7 @@ class _NavigationSettingsScreenState extends State<NavigationSettingsScreen> {
             Text(
               value,
               style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                color: Theme.of(context).textTheme.bodySmall?.color?.withOpacity(0.6),
+                color: Theme.of(context).textTheme.bodySmall?.color?.withValues(alpha: 0.6),
               ),
             ),
             const SizedBox(width: 8),

lib/screens/operator_profile_editor.dart

@@ -105,7 +105,6 @@ class _OperatorProfileEditorState extends State<OperatorProfileEditor> {
     
     return List.generate(_tags.length, (i) {
       final keyController = TextEditingController(text: _tags[i].key);
-      final valueController = TextEditingController(text: _tags[i].value);
       
       return Padding(
         padding: const EdgeInsets.only(bottom: 8.0),

lib/screens/osm_account_screen.dart

@@ -275,7 +275,7 @@ class _OSMAccountScreenState extends State<OSMAccountScreen> {
             Container(
               padding: const EdgeInsets.all(12.0),
               decoration: BoxDecoration(
-                color: Theme.of(context).colorScheme.surfaceVariant.withOpacity(0.5),
+                color: Theme.of(context).colorScheme.surfaceContainerHighest.withValues(alpha: 0.5),
                 borderRadius: BorderRadius.circular(8.0),
               ),
               child: Row(
@@ -308,7 +308,7 @@ class _OSMAccountScreenState extends State<OSMAccountScreen> {
                 label: Text(locService.t('auth.deleteAccount')),
                 style: OutlinedButton.styleFrom(
                   foregroundColor: Theme.of(context).colorScheme.error,
-                  side: BorderSide(color: Theme.of(context).colorScheme.error.withOpacity(0.5)),
+                  side: BorderSide(color: Theme.of(context).colorScheme.error.withValues(alpha: 0.5)),
                 ),
               ),
             ),
@@ -354,10 +354,10 @@ class _OSMAccountScreenState extends State<OSMAccountScreen> {
             Container(
               padding: const EdgeInsets.all(12.0),
               decoration: BoxDecoration(
-                color: Theme.of(context).colorScheme.errorContainer.withOpacity(0.1),
+                color: Theme.of(context).colorScheme.errorContainer.withValues(alpha: 0.1),
                 borderRadius: BorderRadius.circular(8.0),
                 border: Border.all(
-                  color: Theme.of(context).colorScheme.error.withOpacity(0.3),
+                  color: Theme.of(context).colorScheme.error.withValues(alpha: 0.3),
                 ),
               ),
               child: Text(

lib/screens/profile_editor.dart

@@ -153,7 +153,6 @@ class _ProfileEditorState extends State<ProfileEditor> {
     
     return List.generate(_tags.length, (i) {
       final keyController = TextEditingController(text: _tags[i].key);
-      final valueController = TextEditingController(text: _tags[i].value);
       
       return Padding(
         padding: const EdgeInsets.only(bottom: 8.0),

lib/screens/release_notes_screen.dart

@@ -99,7 +99,7 @@ class _ReleaseNotesScreenState extends State<ReleaseNotesScreen> {
                         color: Theme.of(context).colorScheme.primaryContainer,
                         borderRadius: BorderRadius.circular(8),
                         border: Border.all(
-                          color: Theme.of(context).colorScheme.primary.withOpacity(0.3),
+                          color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.3),
                         ),
                       ),
                       child: Row(
@@ -142,8 +142,8 @@ class _ReleaseNotesScreenState extends State<ReleaseNotesScreen> {
         decoration: BoxDecoration(
           border: Border.all(
             color: isCurrentVersion
-                ? Theme.of(context).colorScheme.primary.withOpacity(0.3)
+                ? Theme.of(context).colorScheme.primary.withValues(alpha: 0.3)
-                : Theme.of(context).dividerColor.withOpacity(0.3),
+                : Theme.of(context).dividerColor.withValues(alpha: 0.3),
           ),
           borderRadius: BorderRadius.circular(8),
         ),

lib/screens/settings/sections/language_section.dart

@@ -23,14 +23,14 @@ class _LanguageSectionState extends State<LanguageSection> {
     _loadLanguageNames();
   }
 
-  _loadSelectedLanguage() async {
+  Future<void> _loadSelectedLanguage() async {
     final prefs = await SharedPreferences.getInstance();
     setState(() {
       _selectedLanguage = prefs.getString('language_code');
     });
   }
 
-  _loadLanguageNames() async {
+  Future<void> _loadLanguageNames() async {
     final locService = LocalizationService.instance;
     final Map<String, String> names = {};
     
@@ -43,7 +43,7 @@ class _LanguageSectionState extends State<LanguageSection> {
     });
   }
 
-  _setLanguage(String? languageCode) async {
+  Future<void> _setLanguage(String? languageCode) async {
     await LocalizationService.instance.setLanguage(languageCode);
     setState(() {
       _selectedLanguage = languageCode;

lib/screens/settings/sections/node_profiles_section.dart

@@ -118,7 +118,7 @@ class NodeProfilesSection extends StatelessWidget {
     );
     
     // If user chose to create custom profile, open the profile editor
-    if (result == 'create') {
+    if (result == 'create' && context.mounted) {
       _createNewProfile(context);
     }
     // If user chose import from website, ProfileAddChoiceDialog handles opening the URL

lib/screens/settings/sections/offline_areas_section.dart

@@ -87,9 +87,9 @@ class _OfflineAreasSectionState extends State<OfflineAreasSection> {
                     : "${(area.sizeBytes / 1024).toStringAsFixed(1)} ${locService.t('offlineAreas.kilobytes')}"
                 : '--';
                 
-            String subtitle = '${locService.t('offlineAreas.provider')}: ${area.tileProviderDisplay}\n' +
+            String subtitle = '${locService.t('offlineAreas.provider')}: ${area.tileProviderDisplay}\n'
-                '${locService.t('offlineAreas.maxZoom')}: Z${area.maxZoom}' + '\n' +
+                '${locService.t('offlineAreas.maxZoom')}: Z${area.maxZoom}\n'
-                '${locService.t('offlineAreas.latitude')}: ${area.bounds.southWest.latitude.toStringAsFixed(3)}, ${area.bounds.southWest.longitude.toStringAsFixed(3)}\n' +
+                '${locService.t('offlineAreas.latitude')}: ${area.bounds.southWest.latitude.toStringAsFixed(3)}, ${area.bounds.southWest.longitude.toStringAsFixed(3)}\n'
                 '${locService.t('offlineAreas.latitude')}: ${area.bounds.northEast.latitude.toStringAsFixed(3)}, ${area.bounds.northEast.longitude.toStringAsFixed(3)}';
                 
             if (area.status == OfflineAreaStatus.downloading) {
@@ -207,7 +207,7 @@ class _OfflineAreasSectionState extends State<OfflineAreasSection> {
                 : null,
           ),
           );
-        }).toList(),
+        }),
           ],
         );
       },

lib/screens/settings/sections/proximity_alerts_section.dart

@@ -140,9 +140,9 @@ class _ProximityAlertsSectionState extends State<ProximityAlertsSection> {
               Container(
                 padding: const EdgeInsets.all(12),
                 decoration: BoxDecoration(
-                  color: Colors.orange.withOpacity(0.1),
+                  color: Colors.orange.withValues(alpha: 0.1),
                   borderRadius: BorderRadius.circular(8),
-                  border: Border.all(color: Colors.orange.withOpacity(0.3)),
+                  border: Border.all(color: Colors.orange.withValues(alpha: 0.3)),
                 ),
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
@@ -233,7 +233,7 @@ class _ProximityAlertsSectionState extends State<ProximityAlertsSection> {
                     DistanceService.convertFromMeters(kProximityAlertDefaultDistance.toDouble(), appState.distanceUnit).round().toString(),
                   ]),
                   style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                    color: Theme.of(context).textTheme.bodySmall?.color?.withOpacity(0.6),
+                    color: Theme.of(context).textTheme.bodySmall?.color?.withValues(alpha: 0.6),
                   ),
                 ),
               ],

lib/screens/settings/sections/queue_section.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../../../app_state.dart';
 import '../../../services/localization_service.dart';
-import '../../../state/settings_state.dart';
 
 class QueueSection extends StatelessWidget {
   const QueueSection({super.key});
@@ -116,16 +115,16 @@ class QueueSection extends StatelessWidget {
                             (upload.error ? locService.t('queue.error') : "") +
                             (upload.completing ? locService.t('queue.completing') : "")),
                         subtitle: Text(
-                          locService.t('queue.destination', params: [_getUploadModeDisplayName(upload.uploadMode)]) + '\n' +
+                          '${locService.t('queue.destination', params: [_getUploadModeDisplayName(upload.uploadMode)])}\n'
-                          locService.t('queue.latitude', params: [upload.coord.latitude.toStringAsFixed(6)]) + '\n' +
+                          '${locService.t('queue.latitude', params: [upload.coord.latitude.toStringAsFixed(6)])}\n'
-                          locService.t('queue.longitude', params: [upload.coord.longitude.toStringAsFixed(6)]) + '\n' +
+                          '${locService.t('queue.longitude', params: [upload.coord.longitude.toStringAsFixed(6)])}\n'
-                          locService.t('queue.direction', params: [
+                          '${locService.t('queue.direction', params: [
-                            upload.direction is String 
+                            upload.direction is String
                                 ? upload.direction.toString()
                                 : upload.direction.round().toString()
-                          ]) + '\n' +
+                          ])}\n'
-                          locService.t('queue.attempts', params: [upload.attempts.toString()]) +
+                          '${locService.t('queue.attempts', params: [upload.attempts.toString()])}'
-                          (upload.error ? "\n${locService.t('queue.uploadFailedRetry')}" : "")
+                          '${upload.error ? "\n${locService.t('queue.uploadFailedRetry')}" : ""}'
                         ),
                         trailing: Row(
                           mainAxisSize: MainAxisSize.min,

lib/screens/settings/sections/tile_provider_section.dart

@@ -44,7 +44,7 @@ class TileProviderSection extends StatelessWidget {
                 ),
               )
             else
-              ...providers.map((provider) => _buildProviderTile(context, provider, appState)).toList(),
+              ...providers.map((provider) => _buildProviderTile(context, provider, appState)),
           ],
         );
       },
@@ -89,7 +89,7 @@ class TileProviderSection extends StatelessWidget {
         leading: CircleAvatar(
           backgroundColor: isSelected 
               ? Theme.of(context).colorScheme.primary
-              : Theme.of(context).colorScheme.surfaceVariant,
+              : Theme.of(context).colorScheme.surfaceContainerHighest,
           child: Icon(
             Icons.map,
             color: isSelected 

lib/screens/settings/sections/upload_mode_section.dart

@@ -81,7 +81,7 @@ class UploadModeSection extends StatelessWidget {
                               fontSize: 12, 
                               color: appState.pendingCount > 0 
                                 ? Theme.of(context).disabledColor
-                                : Theme.of(context).colorScheme.onSurface.withOpacity(0.7)
+                                : Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.7)
                             )
                           );
                         case UploadMode.sandbox:
@@ -95,7 +95,6 @@ class UploadModeSection extends StatelessWidget {
                             ),
                           );
                         case UploadMode.simulate:
-                        default:
                           return Text(
                             locService.t('uploadMode.simulateDescription'), 
                             style: TextStyle(

lib/screens/settings_screen.dart

@@ -102,7 +102,7 @@ class SettingsScreen extends StatelessWidget {
               child: Text(
                 'Version: ${VersionService().version}',
                 style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                  color: Theme.of(context).textTheme.bodySmall?.color?.withOpacity(0.6),
+                  color: Theme.of(context).textTheme.bodySmall?.color?.withValues(alpha: 0.6),
                 ),
                 textAlign: TextAlign.center,
               ),

lib/screens/tile_provider_editor_screen.dart

@@ -2,7 +2,6 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:http/http.dart' as http;
-import 'package:collection/collection.dart';
 
 import '../app_state.dart';
 import '../models/tile_provider.dart';

lib/screens/upload_queue_screen.dart

@@ -3,7 +3,6 @@ import 'package:provider/provider.dart';
 import '../app_state.dart';
 import '../models/pending_upload.dart';
 import '../services/localization_service.dart';
-import '../state/settings_state.dart';
 
 class UploadQueueScreen extends StatelessWidget {
   const UploadQueueScreen({super.key});
@@ -114,8 +113,8 @@ class UploadQueueScreen extends StatelessWidget {
                   margin: const EdgeInsets.only(bottom: 16),
                   padding: const EdgeInsets.all(12),
                   decoration: BoxDecoration(
-                    color: Colors.orange.withOpacity(0.1),
+                    color: Colors.orange.withValues(alpha: 0.1),
-                    border: Border.all(color: Colors.orange.withOpacity(0.3)),
+                    border: Border.all(color: Colors.orange.withValues(alpha: 0.3)),
                     borderRadius: BorderRadius.circular(8),
                   ),
                   child: Row(
@@ -205,7 +204,7 @@ class UploadQueueScreen extends StatelessWidget {
                   icon: const Icon(Icons.clear_all),
                   label: Text(locService.t('queue.clearUploadQueue')),
                   style: ElevatedButton.styleFrom(
-                    backgroundColor: appState.pendingCount > 0 ? null : Theme.of(context).disabledColor.withOpacity(0.1),
+                    backgroundColor: appState.pendingCount > 0 ? null : Theme.of(context).disabledColor.withValues(alpha: 0.1),
                   ),
                 ),
               ),
@@ -224,13 +223,13 @@ class UploadQueueScreen extends StatelessWidget {
                         Icon(
                           Icons.check_circle_outline,
                           size: 64,
-                          color: Theme.of(context).textTheme.bodySmall?.color?.withOpacity(0.4),
+                          color: Theme.of(context).textTheme.bodySmall?.color?.withValues(alpha: 0.4),
                         ),
                         const SizedBox(height: 16),
                         Text(
                           locService.t('queue.nothingInQueue'),
                           style: Theme.of(context).textTheme.titleMedium?.copyWith(
-                            color: Theme.of(context).textTheme.bodySmall?.color?.withOpacity(0.6),
+                            color: Theme.of(context).textTheme.bodySmall?.color?.withValues(alpha: 0.6),
                           ),
                           textAlign: TextAlign.center,
                         ),
@@ -272,16 +271,16 @@ class UploadQueueScreen extends StatelessWidget {
                         _getUploadStateText(upload, locService)
                       ),
                       subtitle: Text(
-                        locService.t('queue.destination', params: [_getUploadModeDisplayName(upload.uploadMode)]) + '\n' +
+                        '${locService.t('queue.destination', params: [_getUploadModeDisplayName(upload.uploadMode)])}\n'
-                        locService.t('queue.latitude', params: [upload.coord.latitude.toStringAsFixed(6)]) + '\n' +
+                        '${locService.t('queue.latitude', params: [upload.coord.latitude.toStringAsFixed(6)])}\n'
-                        locService.t('queue.longitude', params: [upload.coord.longitude.toStringAsFixed(6)]) + '\n' +
+                        '${locService.t('queue.longitude', params: [upload.coord.longitude.toStringAsFixed(6)])}\n'
-                        locService.t('queue.direction', params: [
+                        '${locService.t('queue.direction', params: [
-                          upload.direction is String 
+                          upload.direction is String
                               ? upload.direction.toString()
                               : upload.direction.round().toString()
-                        ]) + '\n' +
+                        ])}\n'
-                        locService.t('queue.attempts', params: [upload.attempts.toString()]) +
+                        '${locService.t('queue.attempts', params: [upload.attempts.toString()])}'
-                        (upload.uploadState == UploadState.error ? "\n${locService.t('queue.uploadFailedRetry')}" : "")
+                        '${upload.uploadState == UploadState.error ? "\n${locService.t('queue.uploadFailedRetry')}" : ""}'
                       ),
                       trailing: Row(
                         mainAxisSize: MainAxisSize.min,

lib/services/auth_service.dart

@@ -1,7 +1,7 @@
 import 'dart:convert';
 import 'dart:developer';
-import 'dart:math' as math;
 
+import 'package:flutter/foundation.dart';
 import 'package:oauth2_client/oauth2_client.dart';
 import 'package:oauth2_client/oauth2_helper.dart';
 import 'package:http/http.dart' as http;
@@ -30,7 +30,6 @@ class AuthService {
       case UploadMode.sandbox:
         return 'osm_token_sandbox';
       case UploadMode.simulate:
-      default:
         return 'osm_token_simulate';
     }
   }
@@ -97,10 +96,10 @@ class AuthService {
       final tokenJson = jsonEncode(tokenMap);
       final prefs = await SharedPreferences.getInstance();
       await prefs.setString(_tokenKey, tokenJson); // Save token for current mode
-      _displayName = await _fetchUsername(token!.accessToken!);
+      _displayName = await _fetchUsername(token.accessToken!);
       return _displayName;
     } catch (e) {
-      print('AuthService: OAuth login failed: $e');
+      debugPrint('AuthService: OAuth login failed: $e');
       log('OAuth login failed: $e');
       rethrow;
     }
@@ -128,7 +127,7 @@ class AuthService {
       _displayName = await _fetchUsername(accessToken);
       return _displayName;
     } catch (e) {
-      print('AuthService: Error restoring login with stored token: $e');
+      debugPrint('AuthService: Error restoring login with stored token: $e');
       log('Error restoring login with stored token: $e');
       // Token might be expired or invalid, clear it
       await logout();
@@ -194,7 +193,7 @@ class AuthService {
       final displayName = userData['user']?['display_name'];
       return displayName;
     } catch (e) {
-      print('AuthService: Error fetching username: $e');
+      debugPrint('AuthService: Error fetching username: $e');
       log('Error fetching username: $e');
       return null;
     }

lib/services/changelog_service.dart

@@ -1,5 +1,4 @@
 import 'dart:convert';
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -304,8 +303,8 @@ class ChangelogService {
       final v2Parts = v2.split('.').map(int.parse).toList();
       
       // Ensure we have at least 3 parts (major.minor.patch)
-      while (v1Parts.length < 3) v1Parts.add(0);
+      while (v1Parts.length < 3) { v1Parts.add(0); }
-      while (v2Parts.length < 3) v2Parts.add(0);
+      while (v2Parts.length < 3) { v2Parts.add(0); }
       
       // Compare major version first
       if (v1Parts[0] < v2Parts[0]) return -1;

lib/services/deep_link_service.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'package:app_links/app_links.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/foundation.dart';
 
 import '../models/node_profile.dart';
 import 'profile_import_service.dart';
@@ -87,7 +86,7 @@ class DeepLinkService {
     }
   }
   
-  /// Handle profile add deep link: deflockapp://profiles/add?p=<base64>
+  /// Handle profile add deep link: `deflockapp://profiles/add?p=<base64>`
   void _handleAddProfileLink(Uri uri) {
     final base64Data = uri.queryParameters['p'];
     

lib/services/deflock_tile_provider.dart

@@ -1,12 +1,12 @@
-import 'package:flutter_map/flutter_map.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/widgets.dart';
 import 'dart:async';
 import 'dart:typed_data';
 import 'dart:ui';
 
+import 'package:flutter_map/flutter_map.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
 import '../app_state.dart';
-import '../models/tile_provider.dart' as models;
 import 'map_data_provider.dart';
 import 'offline_area_service.dart';
 
@@ -108,7 +108,7 @@ class DeflockTileImageProvider extends ImageProvider<DeflockTileImageProvider> {
       
       // Re-throw the exception and let FlutterMap handle missing tiles gracefully
       // This is better than trying to provide fallback images
-      throw e;
+      rethrow;
     }
   }
   

lib/services/map_data_provider.dart

@@ -1,6 +1,5 @@
 import 'package:latlong2/latlong.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:flutter/foundation.dart';
 
 import '../models/node_profile.dart';
 import '../models/osm_node.dart';

lib/services/map_data_submodules/nodes_from_osm_api.dart

@@ -1,4 +1,3 @@
-import 'dart:convert';
 import 'package:http/http.dart' as http;
 import 'package:flutter/foundation.dart';
 import 'package:latlong2/latlong.dart';
@@ -81,7 +80,7 @@ Future<List<OsmNode>> _fetchFromOsmApi({
     debugPrint('[fetchOsmApiNodes] Exception: $e');
     
     // Don't report status here - let the top level handle it
-    throw e; // Re-throw to let caller handle
+    rethrow; // Re-throw to let caller handle
   }
 }
 

lib/services/map_data_submodules/tiles_from_local.dart

@@ -1,5 +1,4 @@
 import 'dart:io';
-import 'package:latlong2/latlong.dart';
 import '../offline_area_service.dart';
 import '../offline_areas/offline_area_models.dart';
 import '../offline_areas/offline_tile_utils.dart';

lib/services/network_status.dart

@@ -5,7 +5,7 @@ import 'dart:async';
 /// Only tracks the latest user-initiated request - background requests are ignored.
 enum NetworkRequestStatus {
   idle,        // No active requests
-  loading,     // Request in progress  
+  loading,     // Request in progress
   splitting,   // Request being split due to limits/timeouts
   success,     // Data loaded successfully
   timeout,     // Request timed out

lib/services/node_cache.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:latlong2/latlong.dart';
 import '../models/osm_node.dart';
 import 'package:flutter_map/flutter_map.dart' show LatLngBounds;
@@ -85,7 +86,7 @@ class NodeCache {
   /// Remove a node by ID from the cache (used for successful deletions)
   void removeNodeById(int nodeId) {
     if (_nodes.remove(nodeId) != null) {
-      print('[NodeCache] Removed node $nodeId from cache (successful deletion)');
+      debugPrint('[NodeCache] Removed node $nodeId from cache (successful deletion)');
     }
   }
   
@@ -111,19 +112,19 @@ class NodeCache {
     }
     
     if (nodesToRemove.isNotEmpty) {
-      print('[NodeCache] Removed ${nodesToRemove.length} temp nodes at coordinate ${coord.latitude}, ${coord.longitude}');
+      debugPrint('[NodeCache] Removed ${nodesToRemove.length} temp nodes at coordinate ${coord.latitude}, ${coord.longitude}');
     }
   }
 
   /// Remove a specific temporary node by its ID (for queue item-specific cleanup)
   void removeTempNodeById(int tempNodeId) {
     if (tempNodeId >= 0) {
-      print('[NodeCache] Warning: Attempted to remove non-temp node ID $tempNodeId');
+      debugPrint('[NodeCache] Warning: Attempted to remove non-temp node ID $tempNodeId');
       return;
     }
     
     if (_nodes.remove(tempNodeId) != null) {
-      print('[NodeCache] Removed specific temp node $tempNodeId from cache');
+      debugPrint('[NodeCache] Removed specific temp node $tempNodeId from cache');
     }
   }
 

lib/services/node_data_manager.dart

@@ -1,6 +1,4 @@
 import 'dart:async';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/scheduler.dart';
 import 'package:flutter/widgets.dart';
 import 'package:latlong2/latlong.dart';
 import 'package:flutter_map/flutter_map.dart';

lib/services/offline_area_service.dart

@@ -1,17 +1,14 @@
 import 'dart:io';
 import 'dart:convert';
 import 'package:flutter/foundation.dart';
-import 'package:latlong2/latlong.dart';
 import 'package:flutter_map/flutter_map.dart' show LatLngBounds;
 import 'package:path_provider/path_provider.dart';
 import 'offline_areas/offline_area_models.dart';
 import 'offline_areas/offline_tile_utils.dart';
 import 'offline_areas/offline_area_downloader.dart';
 
-import '../models/osm_node.dart';
 import '../app_state.dart';
 import 'map_data_provider.dart';
-import 'package:deflockapp/dev_config.dart';
 
 /// Service for managing download, storage, and retrieval of offline map areas and cameras.
 class OfflineAreaService {

lib/services/routing_service.dart

@@ -36,9 +36,9 @@ class RoutingService {
     debugPrint('[RoutingService] Calculating route from $start to $end');
 
     final prefs = await SharedPreferences.getInstance();
-    final avoidance_distance = await prefs.getInt('navigation_avoidance_distance');
+    final avoidanceDistance = prefs.getInt('navigation_avoidance_distance') ?? 250;
 
-    final enabled_profiles = AppState.instance.enabledProfiles.map((p) {
+    final enabledProfiles = AppState.instance.enabledProfiles.map((p) {
       final full = p.toJson();
       return {
         'id': full['id'],
@@ -47,7 +47,7 @@ class RoutingService {
       };
     }).toList();
     
-    final uri = Uri.parse('$_baseUrl');
+    final uri = Uri.parse(_baseUrl);
     final params = {
       'start': {
         'longitude': start.longitude,
@@ -57,8 +57,8 @@ class RoutingService {
         'longitude': end.longitude,
         'latitude': end.latitude
       },
-      'avoidance_distance': avoidance_distance,
+      'avoidance_distance': avoidanceDistance,
-      'enabled_profiles': enabled_profiles,
+      'enabled_profiles': enabledProfiles,
       'show_exclusion_zone': false, // for debugging: if true, returns a GeoJSON Feature MultiPolygon showing what areas are avoided in calculating the route
     };
     

lib/services/suspected_location_cache.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:latlong2/latlong.dart';
 
 import '../models/suspected_location.dart';
 import 'suspected_location_service.dart';

lib/services/suspected_location_database.dart

@@ -143,7 +143,6 @@ class SuspectedLocationDatabase {
       
       // Process entries in batches to avoid memory issues
       const batchSize = 1000;
-      int totalInserted = 0;
       int validCount = 0;
       int errorCount = 0;
       
@@ -188,7 +187,6 @@ class SuspectedLocationDatabase {
           
           // Commit this batch
           await batch.commit(noResult: true);
-          totalInserted += currentBatch.length;
           
           // Log progress every few batches
           if ((i ~/ batchSize) % 5 == 0) {

lib/services/suspected_location_service.dart

@@ -1,5 +1,3 @@
-import 'dart:convert';
-import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:http/http.dart' as http;
@@ -208,7 +206,7 @@ class SuspectedLocationService {
               validRows++;
             }
             
-          } catch (e, stackTrace) {
+          } catch (e) {
             // Skip rows that can't be parsed
             debugPrint('[SuspectedLocationService] Error parsing row $rowIndex: $e');
             continue;

lib/services/tile_preview_service.dart

@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 

lib/services/uploader.dart

@@ -147,7 +147,7 @@ class Uploader {
           final currentNodeXml = currentNodeResp.body;
           final versionMatch = RegExp(r'version="(\d+)"').firstMatch(currentNodeXml);
           if (versionMatch == null) {
-            final errorMsg = 'Could not parse version from node XML: ${currentNodeXml.length > 200 ? currentNodeXml.substring(0, 200) + "..." : currentNodeXml}';
+            final errorMsg = 'Could not parse version from node XML: ${currentNodeXml.length > 200 ? '${currentNodeXml.substring(0, 200)}...' : currentNodeXml}';
             debugPrint('[Uploader] $errorMsg');
             return UploadResult.failure(errorMessage: errorMsg, changesetId: changesetId);
           }
@@ -184,7 +184,7 @@ class Uploader {
           final currentNodeXml = currentNodeResp.body;
           final versionMatch = RegExp(r'version="(\d+)"').firstMatch(currentNodeXml);
           if (versionMatch == null) {
-            final errorMsg = 'Could not parse version from node XML for deletion: ${currentNodeXml.length > 200 ? currentNodeXml.substring(0, 200) + "..." : currentNodeXml}';
+            final errorMsg = 'Could not parse version from node XML for deletion: ${currentNodeXml.length > 200 ? '${currentNodeXml.substring(0, 200)}...' : currentNodeXml}';
             debugPrint('[Uploader] $errorMsg');
             return UploadResult.failure(errorMessage: errorMsg, changesetId: changesetId);
           }
@@ -350,12 +350,6 @@ class Uploader {
         headers: _headers,
       ).timeout(kUploadHttpTimeout);
 
-  Future<http.Response> _post(String path, String body) => http.post(
-        Uri.https(_host, path),
-        headers: _headers,
-        body: body,
-      ).timeout(kUploadHttpTimeout);
-
   Future<http.Response> _put(String path, String body) => http.put(
         Uri.https(_host, path),
         headers: _headers,

lib/state/auth_state.dart

@@ -21,7 +21,7 @@ class AuthState extends ChangeNotifier {
         _username = await _auth.restoreLogin();
       }
     } catch (e) {
-      print("AuthState: Error during auth initialization: $e");
+      debugPrint("AuthState: Error during auth initialization: $e");
     }
   }
 
@@ -29,7 +29,7 @@ class AuthState extends ChangeNotifier {
     try {
       _username = await _auth.login();
     } catch (e) {
-      print("AuthState: Login error: $e");
+      debugPrint("AuthState: Login error: $e");
       _username = null;
     }
     notifyListeners();
@@ -49,7 +49,7 @@ class AuthState extends ChangeNotifier {
         _username = null;
       }
     } catch (e) {
-      print("AuthState: Auth refresh error: $e");
+      debugPrint("AuthState: Auth refresh error: $e");
       _username = null;
     }
     notifyListeners();
@@ -59,7 +59,7 @@ class AuthState extends ChangeNotifier {
     try {
       _username = await _auth.forceLogin();
     } catch (e) {
-      print("AuthState: Forced login error: $e");
+      debugPrint("AuthState: Forced login error: $e");
       _username = null;
     }
     notifyListeners();
@@ -69,7 +69,7 @@ class AuthState extends ChangeNotifier {
     try {
       return await _auth.isLoggedIn();
     } catch (e) {
-      print("AuthState: Token validation error: $e");
+      debugPrint("AuthState: Token validation error: $e");
       return false;
     }
   }
@@ -92,7 +92,7 @@ class AuthState extends ChangeNotifier {
       }
     } catch (e) {
       _username = null;
-      print("AuthState: Mode change user restoration error: $e");
+      debugPrint("AuthState: Mode change user restoration error: $e");
     }
     notifyListeners();
   }

lib/state/search_state.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:latlong2/latlong.dart';
 
 import '../models/search_result.dart';
 import '../services/search_service.dart';

lib/state/upload_queue_state.dart

@@ -29,23 +29,23 @@ class UploadQueueState extends ChangeNotifier {
   // Initialize by loading queue from storage and repopulate cache with pending nodes
   Future<void> init() async {
     await _loadQueue();
-    print('[UploadQueue] Loaded ${_queue.length} items from storage');
+    debugPrint('[UploadQueue] Loaded ${_queue.length} items from storage');
     _repopulateCacheFromQueue();
   }
 
   // Repopulate the cache with pending nodes from the queue on startup
   void _repopulateCacheFromQueue() {
-    print('[UploadQueue] Repopulating cache from ${_queue.length} queue items');
+    debugPrint('[UploadQueue] Repopulating cache from ${_queue.length} queue items');
     final nodesToAdd = <OsmNode>[];
     
     for (final upload in _queue) {
       // Skip completed uploads - they should already be in OSM and will be fetched normally
       if (upload.isComplete) {
-        print('[UploadQueue] Skipping completed upload at ${upload.coord}');
+        debugPrint('[UploadQueue] Skipping completed upload at ${upload.coord}');
         continue;
       }
       
-      print('[UploadQueue] Processing ${upload.operation} upload at ${upload.coord}');
+      debugPrint('[UploadQueue] Processing ${upload.operation} upload at ${upload.coord}');
       
       if (upload.isDeletion) {
         // For deletions: mark the original node as pending deletion if it exists in cache
@@ -73,9 +73,7 @@ class UploadQueueState extends ChangeNotifier {
         tags['_temp_id'] = tempId.toString();
         
         // Store temp ID for future cleanup if not already set
-        if (upload.tempNodeId == null) {
+        upload.tempNodeId ??= tempId;
-          upload.tempNodeId = tempId;
-        }
         
         if (upload.isEdit) {
           // For edits: also mark original with _pending_edit if it exists
@@ -112,7 +110,7 @@ class UploadQueueState extends ChangeNotifier {
     
     if (nodesToAdd.isNotEmpty) {
       _nodeCache.addOrUpdate(nodesToAdd);
-      print('[UploadQueue] Repopulated cache with ${nodesToAdd.length} pending nodes from queue');
+      debugPrint('[UploadQueue] Repopulated cache with ${nodesToAdd.length} pending nodes from queue');
       
       // Save queue if we updated any temp IDs for backward compatibility
       _saveQueue();
@@ -587,7 +585,7 @@ class UploadQueueState extends ChangeNotifier {
         // Still have time, will retry after backoff delay
         final nextDelay = item.nextNodeSubmissionRetryDelay;
         final timeLeft = item.timeUntilAutoClose;
-        debugPrint('[UploadQueue] Will retry node submission in ${nextDelay}, ${timeLeft?.inMinutes}m remaining');
+        debugPrint('[UploadQueue] Will retry node submission in $nextDelay, ${timeLeft?.inMinutes}m remaining');
         // No state change needed - attempt count was already updated above
       }
     }
@@ -646,7 +644,7 @@ class UploadQueueState extends ChangeNotifier {
       // Note: This will NEVER error out - will keep trying until 59-minute window expires
       final nextDelay = item.nextChangesetCloseRetryDelay;
       final timeLeft = item.timeUntilAutoClose;
-      debugPrint('[UploadQueue] Changeset close failed (attempt ${item.changesetCloseAttempts}), will retry in ${nextDelay}, ${timeLeft?.inMinutes}m remaining');
+      debugPrint('[UploadQueue] Changeset close failed (attempt ${item.changesetCloseAttempts}), will retry in $nextDelay, ${timeLeft?.inMinutes}m remaining');
       debugPrint('[UploadQueue] Error: ${result.errorMessage}');
       // No additional state change needed - attempt count was already updated above
     }

lib/widgets/add_node_sheet.dart

@@ -7,7 +7,6 @@ import 'package:flutter_map/flutter_map.dart';
 import '../app_state.dart';
 import '../dev_config.dart';
 import '../models/node_profile.dart';
-import '../models/operator_profile.dart';
 import '../services/localization_service.dart';
 import '../services/map_data_provider.dart';
 import '../services/node_data_manager.dart';
@@ -59,23 +58,6 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
     }
   }
 
-  /// Listen for tutorial completion from AppState
-  void _onTutorialCompleted() {
-    _hideTutorial();
-  }
-
-  /// Also check periodically if tutorial was completed by another sheet
-  void _recheckTutorialStatus() async {
-    if (_showTutorial) {
-      final hasCompleted = await ChangelogService().hasCompletedPositioningTutorial();
-      if (hasCompleted && mounted) {
-        setState(() {
-          _showTutorial = false;
-        });
-      }
-    }
-  }
-
   void _hideTutorial() {
     if (mounted && _showTutorial) {
       setState(() {
@@ -107,7 +89,8 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
   void _checkSubmissionGuideAndProceed(BuildContext context, AppState appState, LocalizationService locService) async {
     // Check if user has seen the submission guide
     final hasSeenGuide = await ChangelogService().hasSeenSubmissionGuide();
-    
+    if (!context.mounted) return;
+
     if (!hasSeenGuide) {
       // Show submission guide dialog first
       final shouldProceed = await showDialog<bool>(
@@ -115,13 +98,14 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
         barrierDismissible: false,
         builder: (context) => const SubmissionGuideDialog(),
       );
-      
+      if (!context.mounted) return;
+
       // If user canceled the submission guide, don't proceed with submission
       if (shouldProceed != true) {
         return;
       }
     }
-    
+
     // Now proceed with proximity check
     _checkProximityOnly(context, appState, locService);
   }
@@ -402,11 +386,11 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
         final locService = LocalizationService.instance;
         final appState = context.watch<AppState>();
 
-        void _commit() {
+        void commit() {
           _checkProximityAndCommit(context, appState, locService);
         }
 
-        void _cancel() {
+        void cancel() {
           appState.cancelSession();
           Navigator.pop(context);
         }
@@ -442,11 +426,11 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
             session.profile!.isSubmittable &&
             hasGoodCoverage;
         
-        void _navigateToLogin() {
+        void navigateToLogin() {
           Navigator.pushNamed(context, '/settings/osm-account');
         }
-        
+
-        void _openRefineTags() async {
+        void openRefineTags() async {
           final result = await Navigator.push<RefineTagsResult?>(
             context,
             MaterialPageRoute(
@@ -578,7 +562,7 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
                 child: SizedBox(
                   width: double.infinity,
                   child: OutlinedButton.icon(
-                    onPressed: session.profile != null ? _openRefineTags : null, // Disabled when no profile selected
+                    onPressed: session.profile != null ? openRefineTags : null, // Disabled when no profile selected
                     icon: const Icon(Icons.tune),
                     label: Text(locService.t('addNode.refineTags')),
                   ),
@@ -591,14 +575,14 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
                   children: [
                     Expanded(
                       child: OutlinedButton(
-                        onPressed: _cancel,
+                        onPressed: cancel,
                         child: Text(locService.cancel),
                       ),
                     ),
                     const SizedBox(width: 12),
                     Expanded(
                       child: ElevatedButton(
-                        onPressed: !appState.isLoggedIn ? _navigateToLogin : (allowSubmit ? _commit : null),
+                        onPressed: !appState.isLoggedIn ? navigateToLogin : (allowSubmit ? commit : null),
                         child: Text(!appState.isLoggedIn ? locService.t('actions.logIn') : locService.t('actions.submit')),
                       ),
                     ),

lib/widgets/advanced_edit_options_sheet.dart

@@ -185,6 +185,7 @@ class AdvancedEditOptionsSheet extends StatelessWidget {
     }
     
     // No custom scheme or app launch failed - redirect to app store
+    if (!context.mounted) return;
     await _redirectToAppStore(context, editor);
   }
 

lib/widgets/camera_icon.dart

@@ -40,7 +40,7 @@ class CameraIcon extends StatelessWidget {
       height: kNodeIconDiameter,
       decoration: BoxDecoration(
         shape: BoxShape.circle,
-        color: _ringColor.withOpacity(kNodeDotOpacity),
+        color: _ringColor.withValues(alpha: kNodeDotOpacity),
         border: Border.all(
           color: _ringColor,
           width: getNodeRingThickness(context),

lib/widgets/changelog_dialog.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import '../services/changelog_service.dart';
 import '../services/version_service.dart';
 
 class ChangelogDialog extends StatelessWidget {

lib/widgets/compass_indicator.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'dart:math';
 import 'package:flutter/material.dart';
-import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_animations/flutter_map_animations.dart';
 import 'package:provider/provider.dart';
 
@@ -97,8 +96,8 @@ class _CompassIndicatorState extends State<CompassIndicator> {
               height: 52,
               decoration: BoxDecoration(
                 color: isDisabled 
-                    ? Colors.grey.withOpacity(0.8)
+                    ? Colors.grey.withValues(alpha: 0.8)
-                    : Colors.white.withOpacity(0.95),
+                    : Colors.white.withValues(alpha: 0.95),
                 shape: BoxShape.circle,
                 border: Border.all(
                   color: isDisabled 
@@ -108,7 +107,7 @@ class _CompassIndicatorState extends State<CompassIndicator> {
                 ),
                 boxShadow: [
                   BoxShadow(
-                    color: Colors.black.withOpacity(0.25),
+                    color: Colors.black.withValues(alpha: 0.25),
                     blurRadius: 6,
                     offset: const Offset(0, 3),
                   ),

lib/widgets/download_area_dialog.dart

@@ -57,8 +57,7 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
     }
     
     final minZoom = 1; // Always start from zoom 1 to show area overview when zoomed out
-    final maxZoom = _zoom.toInt();
+
-    
     // Calculate maximum possible zoom based on tile count limit and tile provider max zoom
     final maxPossibleZoom = _calculateMaxZoomForTileLimit(bounds, minZoom);
     
@@ -124,7 +123,6 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
         final locService = LocalizationService.instance;
         final appState = context.watch<AppState>();
         final bounds = widget.controller.camera.visibleBounds;
-        final maxZoom = _zoom.toInt();
         final isOfflineMode = appState.offlineMode;
         
         // Use the calculated max possible zoom instead of fixed span
@@ -191,8 +189,8 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
                       padding: const EdgeInsets.all(8),
                       decoration: BoxDecoration(
                         color: _tileCount! > kMaxReasonableTileCount 
-                            ? Colors.orange.withOpacity(0.1)
+                            ? Colors.orange.withValues(alpha: 0.1)
-                            : Colors.green.withOpacity(0.1),
+                            : Colors.green.withValues(alpha: 0.1),
                         borderRadius: BorderRadius.circular(4),
                       ),
                       child: Column(
@@ -200,7 +198,7 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
                         children: [
                           Text(
                             _tileCount! > kMaxReasonableTileCount 
-                                ? 'Above recommended limit (Z${_maxPossibleZoom})'
+                                ? 'Above recommended limit (Z$_maxPossibleZoom)'
                                 : locService.t('download.maxRecommendedZoom', params: [_maxPossibleZoom.toString()]),
                             style: TextStyle(
                               fontSize: 12,
@@ -213,7 +211,7 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
                           const SizedBox(height: 2),
                           Text(
                             _tileCount! > kMaxReasonableTileCount
-                                ? 'Current selection exceeds ${kMaxReasonableTileCount} recommended tile limit but is within ${kAbsoluteMaxTileCount} absolute limit'
+                                ? 'Current selection exceeds $kMaxReasonableTileCount recommended tile limit but is within $kAbsoluteMaxTileCount absolute limit'
                                 : locService.t('download.withinTileLimit', params: [kMaxReasonableTileCount.toString()]),
                             style: TextStyle(
                               fontSize: 11,
@@ -232,9 +230,9 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
                     child: Container(
                       padding: const EdgeInsets.all(12),
                       decoration: BoxDecoration(
-                        color: Colors.orange.withOpacity(0.1),
+                        color: Colors.orange.withValues(alpha: 0.1),
                         borderRadius: BorderRadius.circular(8),
-                        border: Border.all(color: Colors.orange.withOpacity(0.3)),
+                        border: Border.all(color: Colors.orange.withValues(alpha: 0.3)),
                       ),
                       child: Row(
                         children: [
@@ -266,8 +264,9 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
                 try {
                   final id = DateTime.now().toIso8601String().replaceAll(':', '-');
                   final appDocDir = await OfflineAreaService().getOfflineAreaDir();
+                  if (!context.mounted) return;
                   final dir = "${appDocDir.path}/$id";
-                  
+
                   // Get current tile provider info
                   final appState = context.read<AppState>();
                   final selectedProvider = appState.selectedTileProvider;
@@ -294,6 +293,7 @@ class _DownloadAreaDialogState extends State<DownloadAreaDialog> {
                     builder: (context) => const DownloadStartedDialog(),
                   );
                 } catch (e) {
+                  if (!context.mounted) return;
                   Navigator.pop(context);
                   showDialog(
                     context: context,

lib/widgets/edit_node_sheet.dart

@@ -7,14 +7,11 @@ import 'package:flutter_map/flutter_map.dart';
 import '../app_state.dart';
 import '../dev_config.dart';
 import '../models/node_profile.dart';
-import '../models/operator_profile.dart';
 import '../models/pending_upload.dart';
 import '../services/localization_service.dart';
 import '../services/map_data_provider.dart';
 import '../services/node_data_manager.dart';
 import '../services/changelog_service.dart';
-import '../state/settings_state.dart';
-import '../state/session_state.dart';
 import 'refine_tags_sheet.dart';
 import 'advanced_edit_options_sheet.dart';
 import 'proximity_warning_dialog.dart';
@@ -95,7 +92,8 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
   void _checkSubmissionGuideAndProceed(BuildContext context, AppState appState, LocalizationService locService) async {
     // Check if user has seen the submission guide
     final hasSeenGuide = await ChangelogService().hasSeenSubmissionGuide();
-    
+    if (!context.mounted) return;
+
     if (!hasSeenGuide) {
       // Show submission guide dialog first
       final shouldProceed = await showDialog<bool>(
@@ -103,13 +101,14 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
         barrierDismissible: false,
         builder: (context) => const SubmissionGuideDialog(),
       );
-      
+      if (!context.mounted) return;
+
       // If user canceled the submission guide, don't proceed with submission
       if (shouldProceed != true) {
         return;
       }
     }
-    
+
     // Now proceed with proximity check
     _checkProximityOnly(context, appState, locService);
   }
@@ -435,25 +434,23 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
         final locService = LocalizationService.instance;
         final appState = context.watch<AppState>();
 
-        void _commit() {
+        void commit() {
           // Check if there are any actual changes to submit
           if (!_hasActualChanges(widget.session)) {
             _showNoChangesDialog(context, locService);
             return;
           }
-          
+
           _checkProximityAndCommit(context, appState, locService);
         }
 
-        void _cancel() {
+        void cancel() {
           appState.cancelEditSession();
           Navigator.pop(context);
         }
 
         final session = widget.session;
         final submittableProfiles = appState.enabledProfiles.where((p) => p.isSubmittable).toList();
-        final isSandboxMode = appState.uploadMode == UploadMode.sandbox;
-        
         // Check if we have good cache coverage around the node position
         bool hasGoodCoverage = true;
         final nodeCoord = session.originalNode.coord;
@@ -481,11 +478,11 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
             session.profile!.isSubmittable &&
             hasGoodCoverage;
         
-        void _navigateToLogin() {
+        void navigateToLogin() {
           Navigator.pushNamed(context, '/settings/osm-account');
         }
-        
+
-        void _openRefineTags() async {
+        void openRefineTags() async {
           final result = await Navigator.push<RefineTagsResult?>(
             context,
             MaterialPageRoute(
@@ -694,7 +691,7 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
                 child: SizedBox(
                   width: double.infinity,
                   child: OutlinedButton.icon(
-                    onPressed: session.profile != null ? _openRefineTags : null, // Disabled when no profile selected
+                    onPressed: session.profile != null ? openRefineTags : null, // Disabled when no profile selected
                     icon: const Icon(Icons.tune),
                     label: Text(locService.t('editNode.refineTags')),
                   ),
@@ -707,14 +704,14 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
                   children: [
                     Expanded(
                       child: OutlinedButton(
-                        onPressed: _cancel,
+                        onPressed: cancel,
                         child: Text(locService.cancel),
                       ),
                     ),
                     const SizedBox(width: 12),
                     Expanded(
                       child: ElevatedButton(
-                        onPressed: !appState.isLoggedIn ? _navigateToLogin : (allowSubmit ? _commit : null),
+                        onPressed: !appState.isLoggedIn ? navigateToLogin : (allowSubmit ? commit : null),
                         child: Text(!appState.isLoggedIn ? locService.t('actions.logIn') : locService.t('actions.saveEdit')),
                       ),
                     ),

lib/widgets/map/direction_cones.dart

@@ -6,7 +6,6 @@ import 'package:latlong2/latlong.dart';
 import '../../app_state.dart';
 import '../../dev_config.dart';
 import '../../models/osm_node.dart';
-import '../../models/direction_fov.dart';
 
 /// Helper class to build direction cone polygons for cameras
 class DirectionConesBuilder {
@@ -113,11 +112,6 @@ class DirectionConesBuilder {
            node.coord.longitude.abs() <= 180;
   }
 
-  static bool _isPendingUpload(OsmNode node) {
-    return node.tags.containsKey('_pending_upload') && 
-           node.tags['_pending_upload'] == 'true';
-  }
-
   /// Build cone with variable FOV width - new method for range notation support
   static Polygon _buildConeWithFov(
     LatLng origin, 
@@ -141,28 +135,6 @@ class DirectionConesBuilder {
     );
   }
 
-  /// Legacy method for backward compatibility - uses dev_config FOV
-  static Polygon _buildCone(
-    LatLng origin, 
-    double bearingDeg, 
-    double zoom, {
-    required BuildContext context,
-    bool isPending = false,
-    bool isSession = false,
-    bool isActiveDirection = true,
-  }) {
-    return _buildConeInternal(
-      origin: origin,
-      bearingDeg: bearingDeg,
-      halfAngleDeg: kDirectionConeHalfAngle,
-      zoom: zoom,
-      context: context,
-      isPending: isPending,
-      isSession: isSession,
-      isActiveDirection: isActiveDirection,
-    );
-  }
-
   /// Internal cone building method that handles the actual rendering
   static Polygon _buildConeInternal({
     required LatLng origin,
@@ -231,7 +203,7 @@ class DirectionConesBuilder {
 
     return Polygon(
       points: points,
-      color: kDirectionConeColor.withOpacity(opacity),
+      color: kDirectionConeColor.withValues(alpha: opacity),
       borderColor: kDirectionConeColor,
       borderStrokeWidth: getDirectionConeBorderWidth(context),
     );
@@ -279,7 +251,7 @@ class DirectionConesBuilder {
 
     return Polygon(
       points: points,
-      color: kDirectionConeColor.withOpacity(opacity),
+      color: kDirectionConeColor.withValues(alpha: opacity),
       borderColor: kDirectionConeColor,
       borderStrokeWidth: getDirectionConeBorderWidth(context),
     );

lib/widgets/map/layer_selector_button.dart

@@ -81,7 +81,7 @@ class _LayerSelectorDialogState extends State<_LayerSelectorDialog> {
             Container(
               padding: const EdgeInsets.all(16),
               decoration: BoxDecoration(
-                color: Theme.of(context).colorScheme.surfaceVariant,
+                color: Theme.of(context).colorScheme.surfaceContainerHighest,
                 borderRadius: const BorderRadius.vertical(top: Radius.circular(12)),
               ),
               child: Row(

lib/widgets/map/map_data_manager.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:flutter_map_animations/flutter_map_animations.dart';
 import 'package:latlong2/latlong.dart';
 
 import '../../models/osm_node.dart';

lib/widgets/map/map_overlays.dart

@@ -1,12 +1,10 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_animations/flutter_map_animations.dart';
 import 'package:provider/provider.dart';
 
 import '../../app_state.dart';
 import '../../dev_config.dart';
 import '../../services/localization_service.dart';
-import '../camera_icon.dart';
 import '../compass_indicator.dart';
 import 'layer_selector_button.dart';
 
@@ -64,8 +62,8 @@ class MapOverlays extends StatelessWidget {
               padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
               decoration: BoxDecoration(
                 color: uploadMode == UploadMode.sandbox
-                    ? Colors.orange.withOpacity(0.90)
+                    ? Colors.orange.withValues(alpha: 0.90)
-                    : Colors.deepPurple.withOpacity(0.80),
+                    : Colors.deepPurple.withValues(alpha: 0.80),
                 borderRadius: BorderRadius.circular(8),
                 boxShadow: const [
                   BoxShadow(color: Colors.black26, blurRadius: 5, offset: Offset(0,2)),
@@ -98,7 +96,7 @@ class MapOverlays extends StatelessWidget {
           child: Container(
             padding: const EdgeInsets.symmetric(horizontal: 7, vertical: 2),
             decoration: BoxDecoration(
-              color: Colors.black.withOpacity(0.52),
+              color: Colors.black.withValues(alpha: 0.52),
               borderRadius: BorderRadius.circular(7),
             ),
             child: Builder(
@@ -131,7 +129,7 @@ class MapOverlays extends StatelessWidget {
               onTap: () => _showAttributionDialog(context, attribution!),
               child: Container(
                 decoration: BoxDecoration(
-                  color: Theme.of(context).colorScheme.surface.withOpacity(0.9),
+                  color: Theme.of(context).colorScheme.surface.withValues(alpha: 0.9),
                   borderRadius: BorderRadius.circular(4),
                 ),
                 padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 4),

lib/widgets/map/marker_layer_builder.dart

@@ -6,7 +6,6 @@ import 'package:latlong2/latlong.dart';
 import '../../models/osm_node.dart';
 import '../../models/suspected_location.dart';
 import '../../app_state.dart';
-import '../../state/session_state.dart';
 import '../../dev_config.dart';
 import '../camera_icon.dart';
 import '../provisional_pin.dart';

lib/widgets/map/node_markers.dart

@@ -20,8 +20,8 @@ class NodeMapMarker extends StatefulWidget {
     required this.mapController, 
     this.onNodeTap,
     this.enabled = true,
-    Key? key,
+    super.key,
-  }) : super(key: key);
+  });
 
   @override
   State<NodeMapMarker> createState() => _NodeMapMarkerState();

lib/widgets/map/node_refresh_controller.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_map_animations/flutter_map_animations.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:latlong2/latlong.dart';
 
 import '../../models/node_profile.dart';
 import '../../app_state.dart' show UploadMode;

lib/widgets/map/overlay_layer_builder.dart

@@ -4,7 +4,6 @@ import 'package:latlong2/latlong.dart';
 
 import '../../models/osm_node.dart';
 import '../../app_state.dart';
-import '../../state/session_state.dart';
 import '../../dev_config.dart';
 import 'direction_cones.dart';
 
@@ -38,7 +37,7 @@ class OverlayLayerBuilder {
         overlays.add(
           Polygon(
             points: selectedLocation.bounds,
-            color: Colors.orange.withOpacity(0.3),
+            color: Colors.orange.withValues(alpha: 0.3),
             borderColor: Colors.orange,
             borderStrokeWidth: 2.0,
           ),

lib/widgets/map/suspected_location_markers.dart

@@ -20,8 +20,8 @@ class SuspectedLocationMapMarker extends StatefulWidget {
     required this.mapController, 
     this.onLocationTap,
     this.enabled = true,
-    Key? key,
+    super.key,
-  }) : super(key: key);
+  });
 
   @override
   State<SuspectedLocationMapMarker> createState() => _SuspectedLocationMapMarkerState();

lib/widgets/map/tile_layer_manager.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:latlong2/latlong.dart';
 
 import '../../models/tile_provider.dart' as models;
 import '../../services/deflock_tile_provider.dart';
@@ -93,7 +92,7 @@ class TileLayerManager {
     return TileLayer(
       urlTemplate: urlTemplate, // Critical for cache key generation
       userAgentPackageName: 'me.deflock.deflockapp',
-      maxZoom: selectedTileType?.maxZoom?.toDouble() ?? 18.0,
+      maxZoom: selectedTileType?.maxZoom.toDouble() ?? 18.0,
       tileProvider: _tileProvider!,
     );
   }

lib/widgets/navigation_sheet.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:latlong2/latlong.dart';
@@ -182,9 +181,9 @@ class NavigationSheet extends StatelessWidget {
                   Container(
                     padding: const EdgeInsets.all(12),
                     decoration: BoxDecoration(
-                      color: Colors.amber.withOpacity(0.1),
+                      color: Colors.amber.withValues(alpha: 0.1),
                       borderRadius: BorderRadius.circular(8),
-                      border: Border.all(color: Colors.amber.withOpacity(0.3)),
+                      border: Border.all(color: Colors.amber.withValues(alpha: 0.3)),
                     ),
                     child: Row(
                       crossAxisAlignment: CrossAxisAlignment.start,
@@ -212,9 +211,9 @@ class NavigationSheet extends StatelessWidget {
                   Container(
                     padding: const EdgeInsets.all(12),
                     decoration: BoxDecoration(
-                      color: Colors.orange.withOpacity(0.1),
+                      color: Colors.orange.withValues(alpha: 0.1),
                       borderRadius: BorderRadius.circular(8),
-                      border: Border.all(color: Colors.orange.withOpacity(0.3)),
+                      border: Border.all(color: Colors.orange.withValues(alpha: 0.3)),
                     ),
                     child: Row(
                       children: [

lib/widgets/node_provider_with_cache.dart

@@ -1,12 +1,9 @@
 import 'dart:async';
 import 'package:flutter/material.dart';
-import 'package:latlong2/latlong.dart';
 import 'package:flutter_map/flutter_map.dart' show LatLngBounds;
 
-import '../services/map_data_provider.dart';
 import '../services/node_data_manager.dart';
 import '../services/node_spatial_cache.dart';
-import '../services/network_status.dart';
 import '../models/node_profile.dart';
 import '../models/osm_node.dart';
 import '../app_state.dart';

lib/widgets/node_tag_sheet.dart

@@ -40,7 +40,7 @@ class NodeTagSheet extends StatelessWidget {
         final isRealOSMNode = !node.tags.containsKey('_pending_upload') &&
                               node.id > 0; // Real OSM nodes have positive IDs
         
-        void _openEditSheet() {
+        void openEditSheet() {
           // Check if node limit is active and warn user
           if (isNodeLimitActive) {
             ScaffoldMessenger.of(context).showSnackBar(
@@ -64,7 +64,7 @@ class NodeTagSheet extends StatelessWidget {
           }
         }
 
-        void _deleteNode() async {
+        void deleteNode() async {
           final shouldDelete = await showDialog<bool>(
             context: context,
             builder: (BuildContext context) {
@@ -95,7 +95,7 @@ class NodeTagSheet extends StatelessWidget {
           }
         }
 
-        void _viewOnOSM() async {
+        void viewOnOSM() async {
           final url = 'https://www.openstreetmap.org/node/${node.id}';
           try {
             final uri = Uri.parse(url);
@@ -117,7 +117,7 @@ class NodeTagSheet extends StatelessWidget {
           }
         }
 
-        void _openAdvancedEdit() {
+        void openAdvancedEdit() {
           showModalBottomSheet(
             context: context,
             isScrollControlled: true,
@@ -177,7 +177,7 @@ class NodeTagSheet extends StatelessWidget {
                                     },
                                     text: e.value,
                                     style: TextStyle(
-                                      color: Theme.of(context).colorScheme.onSurface.withOpacity(0.7),
+                                      color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.7),
                                     ),
                                     linkStyle: TextStyle(
                                       color: Theme.of(context).colorScheme.primary,
@@ -201,7 +201,7 @@ class NodeTagSheet extends StatelessWidget {
                   children: [
                     if (isRealOSMNode) ...[
                       TextButton.icon(
-                        onPressed: () => _viewOnOSM(),
+                        onPressed: () => viewOnOSM(),
                         icon: const Icon(Icons.open_in_new, size: 16),
                         label: Text(locService.t('actions.viewOnOSM')),
                       ),
@@ -209,7 +209,7 @@ class NodeTagSheet extends StatelessWidget {
                     ],
                     if (isEditable) ...[
                       OutlinedButton.icon(
-                        onPressed: _openAdvancedEdit,
+                        onPressed: openAdvancedEdit,
                         icon: const Icon(Icons.open_in_new, size: 18),
                         label: Text(locService.t('actions.advanced')),
                         style: OutlinedButton.styleFrom(
@@ -226,7 +226,7 @@ class NodeTagSheet extends StatelessWidget {
                   children: [
                     if (isEditable) ...[
                       ElevatedButton.icon(
-                        onPressed: _openEditSheet,
+                        onPressed: openEditSheet,
                         icon: const Icon(Icons.edit, size: 18),
                         label: Text(locService.edit),
                         style: ElevatedButton.styleFrom(
@@ -235,7 +235,7 @@ class NodeTagSheet extends StatelessWidget {
                       ),
                       const SizedBox(width: 8),
                       ElevatedButton.icon(
-                        onPressed: node.isConstrained ? null : _deleteNode,
+                        onPressed: node.isConstrained ? null : deleteNode,
                         icon: const Icon(Icons.delete, size: 18),
                         label: Text(locService.t('actions.delete')),
                         style: ElevatedButton.styleFrom(

lib/widgets/nuclear_reset_dialog.dart

@@ -8,15 +8,15 @@ class NuclearResetDialog extends StatelessWidget {
   final String errorReport;
 
   const NuclearResetDialog({
-    Key? key,
+    super.key,
     required this.errorReport,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {
-    return WillPopScope(
+    return PopScope(
       // Prevent back button from closing dialog
-      onWillPop: () async => false,
+      canPop: false,
       child: AlertDialog(
         title: const Row(
           children: [
@@ -96,7 +96,8 @@ class NuclearResetDialog extends StatelessWidget {
     
     // Clear all app data
     await NuclearResetService.clearEverything();
-    
+
+    if (!context.mounted) return;
     // Show non-dismissible dialog
     await showDialog(
       context: context,

lib/widgets/positioning_tutorial_overlay.dart

@@ -30,7 +30,7 @@ class PositioningTutorialOverlay extends StatelessWidget {
               ),
               child: Container(
                 decoration: BoxDecoration(
-                  color: Colors.black.withOpacity(0.3), // Semi-transparent overlay
+                  color: Colors.black.withValues(alpha: 0.3), // Semi-transparent overlay
                 ),
                 child: Center(
                   child: Padding(
@@ -73,7 +73,7 @@ class PositioningTutorialOverlay extends StatelessWidget {
                         Text(
                           locService.t('positioningTutorial.hint'),
                           style: TextStyle(
-                            color: Colors.white.withOpacity(0.8),
+                            color: Colors.white.withValues(alpha: 0.8),
                             fontSize: 14,
                             fontStyle: FontStyle.italic,
                           ),

lib/widgets/provisional_pin.dart

@@ -43,7 +43,7 @@ class LocationPin extends StatelessWidget {
               width: size * 0.4,
               height: size * 0.2,
               decoration: BoxDecoration(
-                color: Colors.black.withOpacity(0.3),
+                color: Colors.black.withValues(alpha: 0.3),
                 borderRadius: BorderRadius.circular(size * 0.1),
               ),
             ),
@@ -64,7 +64,7 @@ class LocationPin extends StatelessWidget {
                 color: Colors.white,
                 shape: BoxShape.circle,
                 border: Border.all(
-                  color: _pinColor.withOpacity(0.8),
+                  color: _pinColor.withValues(alpha: 0.8),
                   width: 1.5,
                 ),
               ),

lib/widgets/proximity_alert_banner.dart

@@ -82,7 +82,7 @@ class _ProximityAlertBannerState extends State<ProximityAlertBanner>
                 color: Colors.red.shade600,
                 boxShadow: [
                   BoxShadow(
-                    color: Colors.black.withOpacity(0.3),
+                    color: Colors.black.withValues(alpha: 0.3),
                     blurRadius: 10,
                     offset: const Offset(0, 2),
                   ),

lib/widgets/proximity_warning_dialog.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:latlong2/latlong.dart';
 
 import '../models/osm_node.dart';
 import '../services/localization_service.dart';

lib/widgets/reauth_messages_dialog.dart

@@ -38,7 +38,7 @@ class ReauthMessagesDialog extends StatelessWidget {
           Container(
             padding: const EdgeInsets.all(12.0),
             decoration: BoxDecoration(
-              color: Theme.of(context).colorScheme.primaryContainer.withOpacity(0.3),
+              color: Theme.of(context).colorScheme.primaryContainer.withValues(alpha: 0.3),
               borderRadius: BorderRadius.circular(8.0),
             ),
             child: Row(

lib/widgets/search_bar.dart

@@ -107,7 +107,7 @@ class _LocationSearchBarState extends State<LocationSearchBar> {
         borderRadius: const BorderRadius.vertical(bottom: Radius.circular(12)),
         boxShadow: [
           BoxShadow(
-            color: Theme.of(context).shadowColor.withOpacity(0.2),
+            color: Theme.of(context).shadowColor.withValues(alpha: 0.2),
             blurRadius: 8,
             offset: const Offset(0, 2),
           ),
@@ -152,7 +152,7 @@ class _LocationSearchBarState extends State<LocationSearchBar> {
                   : null,
               dense: true,
               onTap: () => _onResultTap(result),
-            )).toList(),
+            )),
         ],
       ),
     );
@@ -184,7 +184,7 @@ class _LocationSearchBarState extends State<LocationSearchBar> {
                 borderRadius: BorderRadius.circular(12),
                 boxShadow: [
                   BoxShadow(
-                    color: Theme.of(context).shadowColor.withOpacity(0.2),
+                    color: Theme.of(context).shadowColor.withValues(alpha: 0.2),
                     blurRadius: 8,
                     offset: const Offset(0, 2),
                   ),

lib/widgets/submission_guide_dialog.dart

@@ -81,9 +81,9 @@ class _SubmissionGuideDialogState extends State<SubmissionGuideDialog> {
                     Container(
                       padding: const EdgeInsets.all(12),
                       decoration: BoxDecoration(
-                        color: Colors.blue.withOpacity(0.1),
+                        color: Colors.blue.withValues(alpha: 0.1),
                         borderRadius: BorderRadius.circular(8),
-                        border: Border.all(color: Colors.blue.withOpacity(0.3)),
+                        border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
                       ),
                       child: Text(
                         locService.t('submissionGuide.bestPractices'),
@@ -171,10 +171,10 @@ class _SubmissionGuideDialogState extends State<SubmissionGuideDialog> {
         child: Container(
           padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
           decoration: BoxDecoration(
-            color: Theme.of(context).colorScheme.primary.withOpacity(0.1),
+            color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.1),
             borderRadius: BorderRadius.circular(4),
             border: Border.all(
-              color: Theme.of(context).colorScheme.primary.withOpacity(0.3),
+              color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.3),
             ),
           ),
           child: Text(

lib/widgets/suspected_location_sheet.dart

@@ -1,9 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../models/suspected_location.dart';
-import '../app_state.dart';
 import '../services/localization_service.dart';
 import '../dev_config.dart';
 
@@ -17,7 +15,6 @@ class SuspectedLocationSheet extends StatelessWidget {
     return AnimatedBuilder(
       animation: LocalizationService.instance,
       builder: (context, child) {
-        final appState = context.watch<AppState>();
         final locService = LocalizationService.instance;
 
         // Get all fields except location and ticket_no
@@ -97,7 +94,7 @@ class SuspectedLocationSheet extends StatelessWidget {
                                       : Text(
                                           e.value,
                                           style: TextStyle(
-                                            color: Theme.of(context).colorScheme.onSurface.withOpacity(0.7),
+                                            color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.7),
                                           ),
                                           softWrap: true,
                                         ),
@@ -131,7 +128,7 @@ class SuspectedLocationSheet extends StatelessWidget {
                         child: Text(
                           '${location.centroid.latitude.toStringAsFixed(6)}, ${location.centroid.longitude.toStringAsFixed(6)}',
                           style: TextStyle(
-                            color: Theme.of(context).colorScheme.onSurface.withOpacity(0.7),
+                            color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.7),
                           ),
                           softWrap: true,
                         ),

lib/widgets/welcome_dialog.dart

@@ -88,9 +88,9 @@ class _WelcomeDialogState extends State<WelcomeDialog> {
                     Container(
                       padding: const EdgeInsets.all(12),
                       decoration: BoxDecoration(
-                        color: Colors.orange.withOpacity(0.1),
+                        color: Colors.orange.withValues(alpha: 0.1),
                         borderRadius: BorderRadius.circular(8),
-                        border: Border.all(color: Colors.orange.withOpacity(0.3)),
+                        border: Border.all(color: Colors.orange.withValues(alpha: 0.3)),
                       ),
                       child: Text(
                         locService.t('welcome.firsthandKnowledge'),
@@ -171,10 +171,10 @@ class _WelcomeDialogState extends State<WelcomeDialog> {
         child: Container(
           padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
           decoration: BoxDecoration(
-            color: Theme.of(context).colorScheme.primary.withOpacity(0.1),
+            color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.1),
             borderRadius: BorderRadius.circular(4),
             border: Border.all(
-              color: Theme.of(context).colorScheme.primary.withOpacity(0.3),
+              color: Theme.of(context).colorScheme.primary.withValues(alpha: 0.3),
             ),
           ),
           child: Text(

pubspec.lock

@@ -222,6 +222,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: "3105dc8492f6183fb076ccf1f351ac3d60564bff92e20bfc4af9cc1651f4e7e1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
   flutter_local_notifications:
     dependency: "direct main"
     description:
@@ -496,6 +504,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.0.0"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: "12f842a479589fea194fe5c5a3095abc7be0c1f2ddfa9a0e76aed1dbd26a87df"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.0"
   lists:
     dependency: transitive
     description:

pubspec.yaml

@@ -33,15 +33,18 @@ dependencies:
   shared_preferences: ^2.2.2
   sqflite: ^2.4.1
   path: ^1.8.3
+  path_provider: ^2.1.0
   uuid: ^4.0.0
   package_info_plus: ^8.0.0
   csv: ^6.0.0
+  collection: ^1.18.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
   mocktail: ^1.0.4
   flutter_launcher_icons: ^0.14.4
+  flutter_lints: ^6.0.0
   flutter_native_splash: ^2.4.6
 
 flutter:

test/models/tile_provider_test.dart

@@ -31,16 +31,16 @@ void main() {
       );
 
       // Test 0-3 range
-      final url_0_3_a = tileType0_3.getTileUrl(1, 0, 0);
+      final url03A = tileType0_3.getTileUrl(1, 0, 0);
-      final url_0_3_b = tileType0_3.getTileUrl(1, 3, 0);
+      final url03B = tileType0_3.getTileUrl(1, 3, 0);
-      expect(url_0_3_a, contains('s0.example.com'));
+      expect(url03A, contains('s0.example.com'));
-      expect(url_0_3_b, contains('s3.example.com'));
+      expect(url03B, contains('s3.example.com'));
 
       // Test 1-4 range
-      final url_1_4_a = tileType1_4.getTileUrl(1, 0, 0);
+      final url14A = tileType1_4.getTileUrl(1, 0, 0);
-      final url_1_4_b = tileType1_4.getTileUrl(1, 3, 0);
+      final url14B = tileType1_4.getTileUrl(1, 3, 0);
-      expect(url_1_4_a, contains('s1.example.com'));
+      expect(url14A, contains('s1.example.com'));
-      expect(url_1_4_b, contains('s4.example.com'));
+      expect(url14B, contains('s4.example.com'));
 
       // Test consistency
       final url1 = tileType0_3.getTileUrl(1, 2, 3);