Add shared UI components for mesh application

- Introduced `mesh_ui.dart` with reusable widgets including SectionHeader, MeshCard, StatusChip, StatTile, AvatarCircle, SignalBars, RouteChip, PulseDot, BottomSheetHeader, ErrorRetryCard, and ListEntrance.
- Implemented `path_map_ui.dart` for path map screens, featuring path distance calculations, playback controls, and a summary list of observed paths.
- Created `themed_map_tile_layer.dart` for shared cached map tiles with automatic dark-mode treatment.

lib/widgets/telemetry_location_map.dart

@@ -11,6 +11,7 @@ import '../models/app_settings.dart';
 import '../models/contact.dart';
 import '../services/app_settings_service.dart';
 import '../services/map_tile_cache_service.dart';
+import 'themed_map_tile_layer.dart';
 
 class TelemetryLocationMap extends StatefulWidget {
   final double latitude;
@@ -114,13 +115,7 @@ class _TelemetryLocationMapState extends State<TelemetryLocationMap> {
                       ),
                     ),
                     children: [
-                      TileLayer(
-                        urlTemplate: kMapTileUrlTemplate,
-                        tileProvider: tileCache.tileProvider,
-                        userAgentPackageName:
-                            MapTileCacheService.userAgentPackageName,
-                        maxZoom: 19,
-                      ),
+                      ThemedMapTileLayer(tileCache: tileCache),
                       MarkerLayer(
                         markers: [
                           ...contacts.map(_buildContactMarker),