Implement husband-wife connection dialogue and theme support for learn articles

lib/models/teaching_plan.dart

@@ -0,0 +1,67 @@
+import 'package:hive/hive.dart';
+import 'package:uuid/uuid.dart';
+
+part 'teaching_plan.g.dart';
+
+@HiveType(typeId: 10)
+class TeachingPlan {
+  @HiveField(0)
+  final String id;
+
+  @HiveField(1)
+  final String topic;
+
+  @HiveField(2)
+  final String scriptureReference;
+
+  @HiveField(3)
+  final String notes;
+
+  @HiveField(4)
+  final DateTime date;
+
+  @HiveField(5)
+  final bool isCompleted;
+
+  TeachingPlan({
+    required this.id,
+    required this.topic,
+    required this.scriptureReference,
+    required this.notes,
+    required this.date,
+    this.isCompleted = false,
+  });
+
+  TeachingPlan copyWith({
+    String? topic,
+    String? scriptureReference,
+    String? notes,
+    DateTime? date,
+    bool? isCompleted,
+  }) {
+    return TeachingPlan(
+      id: id,
+      topic: topic ?? this.topic,
+      scriptureReference: scriptureReference ?? this.scriptureReference,
+      notes: notes ?? this.notes,
+      date: date ?? this.date,
+      isCompleted: isCompleted ?? this.isCompleted,
+    );
+  }
+
+  factory TeachingPlan.create({
+    required String topic,
+    required String scriptureReference,
+    required String notes,
+    required DateTime date,
+  }) {
+    return TeachingPlan(
+      id: const Uuid().v4(),
+      topic: topic,
+      scriptureReference: scriptureReference,
+      notes: notes,
+      date: date,
+      isCompleted: false,
+    );
+  }
+}