feat: Complete Phase 1 - Full Flutter app implementation with comprehensive features

Version: 1.1.0

Major changes:
- Implemented complete Flutter app structure with all core features
- Added comprehensive UI screens for auth, countdown, goals, profile, settings, and social features
- Integrated Supabase backend with authentication and data repositories
- Added offline support with Hive caching and local storage
- Implemented comprehensive routing with go_router
- Added location services with Google Maps integration
- Implemented notifications and home widget support
- Added voice recording capabilities and AI chat features
- Created comprehensive test suite and documentation
- Added Android and iOS platform configurations
- Implemented achievements system and social features
- Added calendar integration and bucket list functionality

This represents a complete Phase 1 milestone with 3,775 additions across 31 files.

lifetimer/lib/data/models/calendar_entry_model.dart

@@ -0,0 +1,83 @@
+import 'package:equatable/equatable.dart';
+
+class CalendarEntry extends Equatable {
+  final String id;
+  final String userId;
+  final String? goalId;
+  final DateTime entryDate;
+  final String title;
+  final String? note;
+  final String entryType; // e.g. progress, milestone, reflection
+  final DateTime createdAt;
+
+  const CalendarEntry({
+    required this.id,
+    required this.userId,
+    this.goalId,
+    required this.entryDate,
+    required this.title,
+    this.note,
+    required this.entryType,
+    required this.createdAt,
+  });
+
+  CalendarEntry copyWith({
+    String? id,
+    String? userId,
+    String? goalId,
+    DateTime? entryDate,
+    String? title,
+    String? note,
+    String? entryType,
+    DateTime? createdAt,
+  }) {
+    return CalendarEntry(
+      id: id ?? this.id,
+      userId: userId ?? this.userId,
+      goalId: goalId ?? this.goalId,
+      entryDate: entryDate ?? this.entryDate,
+      title: title ?? this.title,
+      note: note ?? this.note,
+      entryType: entryType ?? this.entryType,
+      createdAt: createdAt ?? this.createdAt,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'user_id': userId,
+      'goal_id': goalId,
+      'entry_date': entryDate.toIso8601String().split('T').first,
+      'title': title,
+      'note': note,
+      'entry_type': entryType,
+      'created_at': createdAt.toIso8601String(),
+    };
+  }
+
+  factory CalendarEntry.fromJson(Map<String, dynamic> json) {
+    return CalendarEntry(
+      id: json['id'] as String,
+      userId: json['user_id'] as String,
+      goalId: json['goal_id'] as String?,
+      entryDate: DateTime.parse(json['entry_date'] as String),
+      title: json['title'] as String,
+      note: json['note'] as String?,
+      entryType: json['entry_type'] as String? ?? 'note',
+      createdAt: DateTime.parse(json['created_at'] as String),
+    );
+  }
+
+  @override
+  List<Object?> get props => [
+        id,
+        userId,
+        goalId,
+        entryDate,
+        title,
+        note,
+        entryType,
+        createdAt,
+      ];
+}