Enhance offline upload, error handling, and CI workflows

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @MrAlders0n

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main, dev]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze & Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+
+      - run: flutter pub get
+      - run: dart run build_runner build --delete-conflicting-outputs
+      - run: flutter analyze
+      - run: flutter test

assets/device-models.json

@@ -243,6 +243,14 @@
       "txPower": 22,
       "notes": "Seeed Tracker T1000"
     },
+    {
+      "manufacturer": "Seeed Xiao-nrf52",
+      "shortName": "Seeed Xiao nRF52",
+      "power": 0.3,
+      "platform": "nrf52",
+      "txPower": 22,
+      "notes": "Seeed Xiao nRF52840 bare board, no PA amplifier"
+    },
     {
       "manufacturer": "Xiao C3",
       "shortName": "Xiao C3",

lib/models/user_preferences.dart

@@ -188,7 +188,7 @@ class UserPreferences {
       autoStopAfterIdle: (json['autoStopAfterIdle'] as bool?) ?? true,
       showTopRepeaters: (json['showTopRepeaters'] as bool?) ?? false,
       markerStyle: (json['markerStyle'] as String?) ?? 'dot',
-      gpsMarkerStyle: (json['gpsMarkerStyle'] as String?) ?? 'arrow',
+      gpsMarkerStyle: _migrateGpsMarkerStyle(json['gpsMarkerStyle'] as String?),
       colorVisionType: (json['colorVisionType'] as String?) ?? 'none',
       mapTilesEnabled: (json['mapTilesEnabled'] as bool?) ?? true,
       disconnectAlertEnabled: (json['disconnectAlertEnabled'] as bool?) ?? false,
@@ -200,6 +200,13 @@ class UserPreferences {
     );
   }
 
+  /// Migrate the legacy 'pacman' gps marker id to 'chomper' after the rename.
+  static String _migrateGpsMarkerStyle(String? value) {
+    if (value == null) return 'arrow';
+    if (value == 'pacman') return 'chomper';
+    return value;
+  }
+
   /// Convert to JSON (for persistence)
   Map<String, dynamic> toJson() {
     return {