feat: Add support for offline vector maps using MBTiles

- Introduced new MapLayerType for vector MBTiles.
- Enhanced MapLayer class to handle vector-specific properties.
- Implemented MBTilesService for managing MBTiles files, including import and deletion functionalities.
- Updated MapManagementScreen to allow importing and managing MBTiles files.
- Added UI components for displaying and interacting with MBTiles layers.
- Integrated vector tile rendering in MapTab, supporting dynamic theme loading.
- Updated pubspec.yaml to include necessary dependencies for MBTiles and vector tiles.

lib/services/tile_cache_service.dart

@@ -1,6 +1,8 @@
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map_tile_caching/flutter_map_tile_caching.dart';
 import 'package:flutter_map_tile_caching/custom_backend_api.dart';
+import 'package:vector_map_tiles_mbtiles/vector_map_tiles_mbtiles.dart';
+import 'package:mbtiles/mbtiles.dart';
 import '../models/map_layer.dart';
 
 class TileCacheService {
@@ -144,6 +146,28 @@ class TileCacheService {
     };
   }
 
+  /// Get vector tile provider for MBTiles layers
+  MbTilesVectorTileProvider? getVectorTileProvider(MapLayer layer) {
+    if (!layer.isVector || layer.mbtilesFile == null) {
+      return null;
+    }
+
+    try {
+      final mbtiles = MbTiles(
+        mbtilesPath: layer.mbtilesFile!.path,
+        gzip: layer.isGzipped ?? false,
+      );
+
+      return MbTilesVectorTileProvider(
+        mbtiles: mbtiles,
+        silenceTileNotFound: true,
+      );
+    } catch (e) {
+      print('Error creating vector tile provider: $e');
+      return null;
+    }
+  }
+
   void dispose() {
     _isInitialized = false;
   }