feat(proj): init

mobile/test/theme_controller_test.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:please_pay_me/theme/theme.dart';
+
+void main() {
+  group('ThemePreference', () {
+    test('parse falls back to system', () {
+      expect(ThemePreference.parse(null), ThemePreference.system);
+      expect(ThemePreference.parse('nope'), ThemePreference.system);
+      expect(ThemePreference.parse('light'), ThemePreference.light);
+      expect(ThemePreference.parse('dark'), ThemePreference.dark);
+    });
+
+    test('resolve follows the platform only in system mode', () {
+      expect(ThemePreference.system.resolve(Brightness.dark), Brightness.dark);
+      expect(ThemePreference.light.resolve(Brightness.dark), Brightness.light);
+      expect(ThemePreference.dark.resolve(Brightness.light), Brightness.dark);
+    });
+  });
+
+  group('systemUiOverlayFor', () {
+    test('dark paints the Android nav bar transparent black without a scrim', () {
+      final overlay = systemUiOverlayFor(Brightness.dark);
+      expect(overlay.systemNavigationBarColor, const Color(0x00000000));
+      expect(overlay.systemNavigationBarContrastEnforced, isFalse);
+      expect(overlay.systemNavigationBarIconBrightness, Brightness.light);
+    });
+  });
+
+  group('ThemeController', () {
+    test('restore and setPreference persist independently of session', () async {
+      final store = MemoryThemeStore('dark');
+      final controller = ThemeController(store: store);
+
+      await controller.restore();
+      expect(controller.preference, ThemePreference.dark);
+
+      await controller.setPreference(ThemePreference.light);
+      expect(controller.preference, ThemePreference.light);
+      expect(store.value, 'light');
+      expect(controller.resolve(Brightness.dark), Brightness.light);
+    });
+  });
+}