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/radio_stats_entry.dart

@@ -7,6 +7,9 @@ import 'package:meshcore_open/l10n/l10n.dart';
 import 'package:meshcore_open/screens/companion_radio_stats_screen.dart';
 import 'package:provider/provider.dart';
 
+import '../theme/mesh_theme.dart';
+import 'mesh_ui.dart';
+
 void pushCompanionRadioStatsScreen(BuildContext context) {
   Navigator.push(
     context,
@@ -140,12 +143,12 @@ class AirActivityDotState extends State<AirActivityDot> {
 
   @override
   Widget build(BuildContext context) {
-    final scheme = Theme.of(context).colorScheme;
     final on = widget.active && _blink;
-    return Icon(
-      Icons.circle,
-      size: 12,
-      color: on ? scheme.primary : scheme.outline,
+    final scheme = Theme.of(context).colorScheme;
+    return PulseDot(
+      color: on ? MeshPalette.blue : scheme.outline,
+      size: 11,
+      animate: false,
     );
   }
 }