fix: apply review feedback — type safety, overdue logic, dead code

- _EmptyState: accept PetType enum directly; use .emoji getter
  (drops string conversion round-trip and duplicate emoji mapping)
- TaskCard: compute _isOverdue from task.deadline when task is provided
  (previously isOverdue never fired when using the task: param)
- userNameProvider: derive from userProvider.name instead of hardcoded 'Zuf'
  (name was split across two independent providers)
- _petMessage: add explicit 'neutral' branch, remove unreachable 'sleepy' branch
  (PetMood enum has no .sleepy; neutral was silently falling to _)
- EnergyBar/EnergyBadge: assert both params not null simultaneously
  (EnergyBar() / EnergyBadge() previously compiled silently with default low)
- todayTasksProvider: fix comment — no date filtering in MVP

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

lib/features/tasks/providers/task_providers.dart

@@ -47,7 +47,8 @@ class TasksNotifier extends Notifier<List<TaskEntity>> {
 final tasksProvider =
     NotifierProvider<TasksNotifier, List<TaskEntity>>(TasksNotifier.new);
 
-/// Alias — today's tasks (same provider, filtered by status in screens).
+/// Alias for [tasksProvider]. Returns all tasks — no date filtering in MVP.
+/// Screens are responsible for splitting into pending/completed.
 final todayTasksProvider = tasksProvider;
 
 /// Pending tasks only, ordered by sort order.

lib/features/tasks/providers/user_providers.dart

@@ -1,4 +1,6 @@
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
-/// Provider for current user name.
-final userNameProvider = Provider<String>((ref) => 'Zuf');
+import 'pet_providers.dart';
+
+/// Derived provider for the current user's display name.
+final userNameProvider = Provider<String>((ref) => ref.watch(userProvider).name);

lib/features/tasks/screens/tasks_screen.dart

@@ -6,6 +6,7 @@ import 'package:google_fonts/google_fonts.dart';
 
 import '../../../core/router/routes.dart';
 import '../../../core/theme/kittie_colors.dart';
+import '../../../domain/entities/pet_type.dart';
 import '../../../shared/utils/czech_date.dart';
 import '../../../shared/widgets/energy_bar.dart';
 import '../../../shared/widgets/pet_bubble.dart';
@@ -34,7 +35,7 @@ class TasksScreen extends ConsumerWidget {
     return Scaffold(
       body: SafeArea(
         child: tasks.isEmpty
-            ? _EmptyState(petType: userState.petType.name)
+            ? _EmptyState(petType: userState.petType)
             : SingleChildScrollView(
                 padding: const EdgeInsets.fromLTRB(20, 16, 20, 100),
                 child: Column(
@@ -157,26 +158,21 @@ class TasksScreen extends ConsumerWidget {
   static String _petMessage(String mood, String petName) {
     return switch (mood) {
       'happy' => '$petName je stastna! Jde ti to skvele \u{1F44F}',
+      'neutral' => '$petName te ceka! Co dnes zvladneme? \u{2728}',
       'sad' => '$petName te podporuje. Zkus jeden ukol \u{1F495}',
-      'sleepy' => '$petName odpociva... Klid je taky dulezity \u{1F4A4}',
-      _ => '$petName te ceka! Co dnes zvladneme? \u{2728}',
+      _ => '$petName je tady pro tebe \u{1F60A}',
     };
   }
 }
 
 class _EmptyState extends StatelessWidget {
-  final String petType;
+  final PetType petType;
 
   const _EmptyState({required this.petType});
 
   @override
   Widget build(BuildContext context) {
-    final emoji = switch (petType) {
-      'dog' => '\u{1F436}',
-      'cat' => '\u{1F431}',
-      'capybara' => '\u{1F9AB}',
-      _ => '\u{1F431}',
-    };
+    final emoji = petType.emoji;
 
     return Center(
       child: Column(

lib/shared/widgets/energy_badge.dart

@@ -27,7 +27,9 @@ enum EnergyLevel {
 /// - medium: orange bg, orange text, sun icon — "Stredni"
 /// - high: red bg, red text, fire icon — "Narocne"
 class EnergyBadge extends StatelessWidget {
-  const EnergyBadge({super.key, this.level, this.energyLevel});
+  const EnergyBadge({super.key, this.level, this.energyLevel})
+      : assert(level != null || energyLevel != null,
+            'Provide either level or energyLevel');
 
   final EnergyLevel? level;
 

lib/shared/widgets/energy_bar.dart

@@ -15,7 +15,8 @@ class EnergyBar extends StatelessWidget {
     this.fraction,
     this.energyLevel,
     this.label = 'ENERGIE',
-  });
+  }) : assert(fraction != null || energyLevel != null,
+            'Provide either fraction or energyLevel');
 
   /// Fill amount from 0.0 (empty) to 1.0 (full).
   final double? fraction;

lib/shared/widgets/task_card.dart

@@ -47,6 +47,10 @@ class TaskCard extends StatelessWidget {
   int get _energyLevel => task?.energyLevel ?? energyLevel ?? 2;
   bool get _isDone => task?.isCompleted ?? isDone;
   bool get _isSelfCare => task?.isSelfCare ?? isSelfCare;
+  bool get _isOverdue {
+    if (task?.deadline != null) return task!.deadline!.isBefore(DateTime.now());
+    return isOverdue;
+  }
   VoidCallback? get _toggleCallback => onComplete ?? onToggle;
 
   @override
@@ -57,7 +61,7 @@ class TaskCard extends StatelessWidget {
         constraints: const BoxConstraints(minHeight: AppConstants.minTouchTarget),
         padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
         decoration: BoxDecoration(
-          color: isOverdue
+          color: _isOverdue
               ? KittieColors.redLight
               : KittieColors.creamDark,
           borderRadius: BorderRadius.circular(AppConstants.cardBorderRadius),