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>

lib/features/rewards/presentation/cubit/reward_cubit.dart

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+import 'package:equatable/equatable.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:focusflow_shared/focusflow_shared.dart';
+
+// ── States ─────────────────────────────────────────────────────────
+
+sealed class RewardState extends Equatable {
+  const RewardState();
+  @override
+  List<Object?> get props => [];
+}
+
+class RewardIdle extends RewardState {}
+
+class RewardShowing extends RewardState {
+  final Reward reward;
+  const RewardShowing(this.reward);
+  @override
+  List<Object?> get props => [reward];
+}
+
+class RewardDismissed extends RewardState {}
+
+// ── Cubit ──────────────────────────────────────────────────────────
+
+/// Manages the reward overlay display lifecycle.
+///
+/// Flow:
+///  1. After a task is completed, call [showReward].
+///  2. The UI renders [RewardPopup] when state is [RewardShowing].
+///  3. User taps dismiss -> call [dismiss].
+class RewardCubit extends Cubit<RewardState> {
+  RewardCubit() : super(RewardIdle());
+
+  /// Show a reward to the user.
+  void showReward(Reward reward) {
+    emit(RewardShowing(reward));
+  }
+
+  /// Dismiss the current reward and return to idle.
+  void dismiss() {
+    emit(RewardDismissed());
+    // Brief delay then return to idle so the cubit is ready for the next reward.
+    Future<void>.delayed(const Duration(milliseconds: 300), () {
+      if (!isClosed) emit(RewardIdle());
+    });
+  }
+}