Extract settings and harden geofence automation

test/settings_theme_provider_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:ignis_app/features/settings/models/app_theme_preset.dart';
+import 'package:ignis_app/features/settings/providers/settings_providers.dart';
+import 'package:ignis_app/features/shared/providers/core_providers.dart';
+import 'package:ignis_app/services/settings_service.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'test_support.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test('app theme notifier updates state and persists selection', () async {
+    SharedPreferences.setMockInitialValues({});
+    final settingsService = SettingsService(
+      credentialsStorage: InMemoryCredentialsStorage(),
+    );
+    final container = ProviderContainer(
+      overrides: [
+        settingsServiceProvider.overrideWithValue(settingsService),
+        initialAppThemePresetProvider.overrideWithValue(AppThemePreset.ember),
+      ],
+    );
+    addTearDown(container.dispose);
+
+    await container
+        .read(appThemeProvider.notifier)
+        .setTheme(AppThemePreset.graphite);
+
+    expect(container.read(appThemeProvider), AppThemePreset.graphite);
+    expect(await settingsService.getAppThemePreset(), AppThemePreset.graphite);
+  });
+}