feat: Add auto-sync, fix partner linking UI, update sharing settings

- Add 10-second periodic auto-sync to CycleEntriesNotifier
- Fix husband_devotional_screen: use partnerId for isConnected check, navigate to SharingSettingsScreen instead of legacy mock dialog
- Remove obsolete _showConnectDialog method and mock data import
- Update husband_settings_screen: show 'Partner Settings' with linked partner name when connected
- Add SharingSettingsScreen: Pad Supplies toggle (disabled when pad tracking off), Intimacy always enabled
- Add CORS OPTIONS handler to backend server
- Add _ensureServerRegistration for reliable partner linking
- Add copy button to Invite Partner dialog
- Dynamic base URL for web (uses window.location.hostname)

lib/models/prayer_request.dart

@@ -0,0 +1,53 @@
+import 'package:hive/hive.dart';
+import 'package:uuid/uuid.dart';
+
+part 'prayer_request.g.dart';
+
+@HiveType(typeId: 15)
+class PrayerRequest extends HiveObject {
+  @HiveField(0)
+  final String id;
+
+  @HiveField(1)
+  final String request;
+
+  @HiveField(2)
+  final bool isAnswered;
+
+  @HiveField(3)
+  final DateTime createdAt;
+
+  @HiveField(4)
+  final DateTime updatedAt;
+
+  PrayerRequest({
+    required this.id,
+    required this.request,
+    this.isAnswered = false,
+    required this.createdAt,
+    required this.updatedAt,
+  });
+
+  PrayerRequest copyWith({
+    String? request,
+    bool? isAnswered,
+    DateTime? updatedAt,
+  }) {
+    return PrayerRequest(
+      id: id,
+      request: request ?? this.request,
+      isAnswered: isAnswered ?? this.isAnswered,
+      createdAt: createdAt,
+      updatedAt: updatedAt ?? DateTime.now(),
+    );
+  }
+
+  factory PrayerRequest.create({required String request}) {
+    return PrayerRequest(
+      id: const Uuid().v4(),
+      request: request,
+      createdAt: DateTime.now(),
+      updatedAt: DateTime.now(),
+    );
+  }
+}

lib/models/prayer_request.g.dart

@@ -0,0 +1,53 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'prayer_request.dart';
+
+// **************************************************************************
+// TypeAdapterGenerator
+// **************************************************************************
+
+class PrayerRequestAdapter extends TypeAdapter<PrayerRequest> {
+  @override
+  final int typeId = 15;
+
+  @override
+  PrayerRequest read(BinaryReader reader) {
+    final numOfFields = reader.readByte();
+    final fields = <int, dynamic>{
+      for (int i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
+    };
+    return PrayerRequest(
+      id: fields[0] as String,
+      request: fields[1] as String,
+      isAnswered: fields[2] as bool,
+      createdAt: fields[3] as DateTime,
+      updatedAt: fields[4] as DateTime,
+    );
+  }
+
+  @override
+  void write(BinaryWriter writer, PrayerRequest obj) {
+    writer
+      ..writeByte(5)
+      ..writeByte(0)
+      ..write(obj.id)
+      ..writeByte(1)
+      ..write(obj.request)
+      ..writeByte(2)
+      ..write(obj.isAnswered)
+      ..writeByte(3)
+      ..write(obj.createdAt)
+      ..writeByte(4)
+      ..write(obj.updatedAt);
+  }
+
+  @override
+  int get hashCode => typeId.hashCode;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is PrayerRequestAdapter &&
+          runtimeType == other.runtimeType &&
+          typeId == other.typeId;
+}

lib/models/user_profile.dart

@@ -313,6 +313,9 @@ class UserProfile extends HiveObject {
   @HiveField(56, defaultValue: false)
   bool useExampleData;
 
+  @HiveField(57)
+  String? partnerId; // ID of the partner to sync with
+
   UserProfile({
     required this.id,
     required this.name,
@@ -370,6 +373,7 @@ class UserProfile extends HiveObject {
     this.husbandThemeMode = AppThemeMode.system,
     this.husbandAccentColor = '0xFF1A3A5C',
     this.useExampleData = false,
+    this.partnerId,
   });
 
   /// Check if user is married
@@ -452,6 +456,7 @@ class UserProfile extends HiveObject {
     AppThemeMode? husbandThemeMode,
     String? husbandAccentColor,
     bool? useExampleData,
+    String? partnerId,
   }) {
     return UserProfile(
       id: id ?? this.id,
@@ -513,6 +518,7 @@ class UserProfile extends HiveObject {
       husbandThemeMode: husbandThemeMode ?? this.husbandThemeMode,
       husbandAccentColor: husbandAccentColor ?? this.husbandAccentColor,
       useExampleData: useExampleData ?? this.useExampleData,
+      partnerId: partnerId ?? this.partnerId,
     );
   }
 }

lib/models/user_profile.g.dart

@@ -123,13 +123,14 @@ class UserProfileAdapter extends TypeAdapter<UserProfile> {
       husbandAccentColor:
           fields[55] == null ? '0xFF1A3A5C' : fields[55] as String,
       useExampleData: fields[56] == null ? false : fields[56] as bool,
+      partnerId: fields[57] as String?,
     );
   }
 
   @override
   void write(BinaryWriter writer, UserProfile obj) {
     writer
-      ..writeByte(56)
+      ..writeByte(57)
       ..writeByte(0)
       ..write(obj.id)
       ..writeByte(1)
@@ -241,7 +242,9 @@ class UserProfileAdapter extends TypeAdapter<UserProfile> {
       ..writeByte(55)
       ..write(obj.husbandAccentColor)
       ..writeByte(56)
-      ..write(obj.useExampleData);
+      ..write(obj.useExampleData)
+      ..writeByte(57)
+      ..write(obj.partnerId);
   }
 
   @override