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/screens/log/pad_tracker_screen.dart

@@ -9,6 +9,9 @@ import '../../services/notification_service.dart';
 import '../../providers/user_provider.dart';
 import '../../widgets/protected_wrapper.dart';
 
+// Global flag to track if the check-in dialog has been shown this session
+bool _hasShownCheckInSession = false;
+
 class PadTrackerScreen extends ConsumerStatefulWidget {
   final FlowIntensity? initialFlow;
   final bool isSpotting;
@@ -81,7 +84,15 @@ class _PadTrackerScreenState extends ConsumerState<PadTrackerScreen> {
         lastChange.month == now.month &&
         lastChange.day == now.day;
 
+    // Check if we already showed it this session
+    if (_hasShownCheckInSession) {
+      debugPrint('_checkInitialPrompt: Already shown this session. Skipping.');
+      return;
+    }
+
     if (!changedToday) {
+      _hasShownCheckInSession = true; // Mark as shown immediately
+
       final result = await showDialog<_PadLogResult>(
         context: context,
         barrierDismissible: false,
@@ -91,7 +102,7 @@ class _PadTrackerScreenState extends ConsumerState<PadTrackerScreen> {
       if (result != null) {
         if (result.skipped) return;
 
-        _finalizeLog(
+        await _finalizeLog(
           result.time,
           result.flow,
           supply: result.supply,
@@ -1162,7 +1173,7 @@ class _PadCheckInDialogState extends ConsumerState<_PadCheckInDialog> {
                 padding: const EdgeInsets.only(left: 16.0),
                 child: DropdownButtonFormField<PadType>(
                   isExpanded: true,
-                  value: _borrowedType,
+                  initialValue: _borrowedType,
                   items: PadType.values.map((t) {
                     return DropdownMenuItem(
                       value: t,