Initial scaffold: FocusFlow ADHD Task Manager Flutter app

BLoC/Cubit state management, ADHD-friendly theme (calming teal, no red),
GetIt DI, GoRouter navigation. Screens: task dashboard, focus mode,
task create/detail, streaks, time perception, settings, onboarding, auth.
Custom widgets: TaskCard, RewardPopup, StreakRing, GentleNudgeCard.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test/widget_test.dart

@@ -0,0 +1,9 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:focusflow_app/app.dart';
+
+void main() {
+  testWidgets('App renders without crashing', (WidgetTester tester) async {
+    await tester.pumpWidget(const FocusFlowApp());
+    expect(find.byType(FocusFlowApp), findsOneWidget);
+  });
+}