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/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