feat: Implement background location tracking service

- Removed existing app icons from the asset catalog.
- Added new `Contents.json` for asset catalog.
- Updated `Info.plist` to include background modes and task scheduler identifiers.
- Exposed BLE service in `ConnectionProvider` for background tracking.
- Enhanced `MapTab` to support background location tracking with new service.
- Added `BackgroundLocationService` to manage location updates in the background.
- Updated `SettingsScreen` to allow users to configure GPS update distance and toggle background tracking.
- Implemented functionality to send location updates via BLE in `MeshCoreBleService`.
- Updated dependencies in `pubspec.yaml` for background service support.
- Adjusted `TileCacheService` to ensure ObjectBox is initialized only once.

.claude/settings.local.json

@@ -2,7 +2,18 @@
   "permissions": {
     "allow": [
       "Bash(flutter analyze:*)",
-      "Bash(flutter devices:*)"
+      "Bash(flutter devices:*)",
+      "Bash(flutter build:*)",
+      "Bash(flutter install:*)",
+      "Bash(open:*)",
+      "Bash(xcrun devicectl device uninstall app:*)",
+      "Bash(pod repo update:*)",
+      "Bash(pod install)",
+      "Bash(flutter clean:*)",
+      "Bash(flutter pub get:*)",
+      "Bash(flutter run:*)",
+      "Bash(nc:*)",
+      "Bash(pkill:*)"
     ],
     "deny": [],
     "ask": []