Add calendar task indicators with priority colors and animation

- Fix calendar navigation using ValueKey to force rebuild
- Add colored dots on calendar days with tasks (red/orange/green)
- Show highest priority of incomplete tasks for each day
- Add subtle pulsing animation to task indicators
- Load tasks for visible month when calendar opens

lib/features/tasks/presentation/pages/calendar_page.dart

@@ -2,6 +2,12 @@ import 'package:flutter/material.dart';
 import 'package:agenda_tasks/l10n/app_localizations.dart';
 import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
+import 'package:provider/provider.dart';
+
+import '../../../../core/di/injection_container.dart';
+import '../../domain/entities/task_entity.dart';
+import '../../domain/enums/priority.dart';
+import '../../domain/repositories/task_repository.dart';
 
 class CalendarPage extends StatefulWidget {
   const CalendarPage({super.key});
@@ -13,11 +19,60 @@ class CalendarPage extends StatefulWidget {
 class _CalendarPageState extends State<CalendarPage> {
   late DateTime _focusedMonth;
   DateTime? _selectedDate;
+  Map<String, List<TaskEntity>> _tasksByDate = {};
+  bool _isLoading = false;
 
   @override
   void initState() {
     super.initState();
     _focusedMonth = DateTime.now();
+    _loadTasksForMonth();
+  }
+
+  Future<void> _loadTasksForMonth() async {
+    setState(() => _isLoading = true);
+
+    final repository = getIt<TaskRepository>();
+    final Map<String, List<TaskEntity>> tasks = {};
+
+    final firstDay = DateTime(_focusedMonth.year, _focusedMonth.month, 1);
+    final lastDay = DateTime(_focusedMonth.year, _focusedMonth.month + 1, 0);
+
+    for (int day = 1; day <= lastDay.day; day++) {
+      final date = DateTime(_focusedMonth.year, _focusedMonth.month, day);
+      final dateStr = DateFormat('yyyy-MM-dd').format(date);
+      final result = await repository.getTasksByDate(date);
+      result.when(
+        success: (data) {
+          if (data.isNotEmpty) {
+            tasks[dateStr] = data;
+          }
+        },
+        error: (_) {},
+      );
+    }
+
+    if (mounted) {
+      setState(() {
+        _tasksByDate = tasks;
+        _isLoading = false;
+      });
+    }
+  }
+
+  Priority? _getHighestPriority(List<TaskEntity>? tasks) {
+    if (tasks == null || tasks.isEmpty) return null;
+
+    final incompleteTasks = tasks.where((t) => !t.isDone).toList();
+    if (incompleteTasks.isEmpty) return null;
+
+    if (incompleteTasks.any((t) => t.priority == Priority.high)) {
+      return Priority.high;
+    }
+    if (incompleteTasks.any((t) => t.priority == Priority.medium)) {
+      return Priority.medium;
+    }
+    return Priority.low;
   }
 
   @override
@@ -42,22 +97,28 @@ class _CalendarPageState extends State<CalendarPage> {
               setState(() {
                 _focusedMonth = DateTime(_focusedMonth.year, _focusedMonth.month - 1);
               });
+              _loadTasksForMonth();
             },
             onNext: () {
               setState(() {
                 _focusedMonth = DateTime(_focusedMonth.year, _focusedMonth.month + 1);
               });
+              _loadTasksForMonth();
             },
           ),
           _WeekdayHeaders(locale: locale),
           Expanded(
-            child: _CalendarGrid(
-              focusedMonth: _focusedMonth,
-              selectedDate: _selectedDate,
-              onDateSelected: (date) {
-                setState(() => _selectedDate = date);
-              },
-            ),
+            child: _isLoading
+                ? const Center(child: CircularProgressIndicator())
+                : _CalendarGrid(
+                    focusedMonth: _focusedMonth,
+                    selectedDate: _selectedDate,
+                    tasksByDate: _tasksByDate,
+                    getHighestPriority: _getHighestPriority,
+                    onDateSelected: (date) {
+                      setState(() => _selectedDate = date);
+                    },
+                  ),
           ),
         ],
       ),
@@ -154,11 +215,15 @@ class _WeekdayHeaders extends StatelessWidget {
 class _CalendarGrid extends StatelessWidget {
   final DateTime focusedMonth;
   final DateTime? selectedDate;
+  final Map<String, List<TaskEntity>> tasksByDate;
+  final Priority? Function(List<TaskEntity>?) getHighestPriority;
   final ValueChanged<DateTime> onDateSelected;
 
   const _CalendarGrid({
     required this.focusedMonth,
     required this.selectedDate,
+    required this.tasksByDate,
+    required this.getHighestPriority,
     required this.onDateSelected,
   });
 
@@ -185,6 +250,7 @@ class _CalendarGrid extends StatelessWidget {
         }
 
         final date = DateTime(focusedMonth.year, focusedMonth.month, dayOffset + 1);
+        final dateStr = DateFormat('yyyy-MM-dd').format(date);
         final isToday = date.year == today.year &&
             date.month == today.month &&
             date.day == today.day;
@@ -193,6 +259,9 @@ class _CalendarGrid extends StatelessWidget {
             date.month == selectedDate!.month &&
             date.day == selectedDate!.day;
 
+        final tasks = tasksByDate[dateStr];
+        final highestPriority = getHighestPriority(tasks);
+
         return GestureDetector(
           onTap: () => onDateSelected(date),
           child: Container(
@@ -205,18 +274,98 @@ class _CalendarGrid extends StatelessWidget {
                       : null,
               borderRadius: BorderRadius.circular(8),
             ),
-            child: Center(
-              child: Text(
-                '${dayOffset + 1}',
-                style: TextStyle(
-                  color: isSelected
-                      ? Theme.of(context).colorScheme.onPrimary
-                      : isToday
-                          ? Theme.of(context).colorScheme.onPrimaryContainer
-                          : null,
-                  fontWeight: isToday || isSelected ? FontWeight.bold : null,
+            child: Stack(
+              alignment: Alignment.center,
+              children: [
+                Text(
+                  '${dayOffset + 1}',
+                  style: TextStyle(
+                    color: isSelected
+                        ? Theme.of(context).colorScheme.onPrimary
+                        : isToday
+                            ? Theme.of(context).colorScheme.onPrimaryContainer
+                            : null,
+                    fontWeight: isToday || isSelected ? FontWeight.bold : null,
+                  ),
                 ),
-              ),
+                if (highestPriority != null)
+                  Positioned(
+                    bottom: 4,
+                    child: _PulsingDot(priority: highestPriority),
+                  ),
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
+
+class _PulsingDot extends StatefulWidget {
+  final Priority priority;
+
+  const _PulsingDot({required this.priority});
+
+  @override
+  State<_PulsingDot> createState() => _PulsingDotState();
+}
+
+class _PulsingDotState extends State<_PulsingDot>
+    with SingleTickerProviderStateMixin {
+  late AnimationController _controller;
+  late Animation<double> _animation;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController(
+      duration: const Duration(milliseconds: 1500),
+      vsync: this,
+    )..repeat(reverse: true);
+
+    _animation = Tween<double>(begin: 0.6, end: 1.0).animate(
+      CurvedAnimation(parent: _controller, curve: Curves.easeInOut),
+    );
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  Color _getPriorityColor() {
+    switch (widget.priority) {
+      case Priority.high:
+        return Colors.red.shade600;
+      case Priority.medium:
+        return Colors.orange.shade600;
+      case Priority.low:
+        return Colors.green.shade600;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBuilder(
+      animation: _animation,
+      builder: (context, child) {
+        return Opacity(
+          opacity: _animation.value,
+          child: Container(
+            width: 6,
+            height: 6,
+            decoration: BoxDecoration(
+              color: _getPriorityColor(),
+              shape: BoxShape.circle,
+              boxShadow: [
+                BoxShadow(
+                  color: _getPriorityColor().withOpacity(0.5),
+                  blurRadius: 2,
+                  spreadRadius: 1,
+                ),
+              ],
             ),
           ),
         );

lib/features/tasks/presentation/pages/daily_agenda_page.dart

@@ -16,7 +16,9 @@ class DailyAgendaPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    // Use key to force rebuild when date changes
     return ChangeNotifierProvider(
+      key: ValueKey(initialDate),
       create: (_) {
         final vm = getIt<DailyTasksViewModel>();
         if (initialDate != null) {