Refactor: Implement multi-item inventory for Pad Tracker and dynamic navigation

lib/screens/settings/sharing_settings_screen.dart

@@ -26,6 +26,17 @@ class SharingSettingsScreen extends ConsumerWidget {
       body: ListView(
         padding: const EdgeInsets.all(16.0),
         children: [
+          ListTile(
+            leading: const Icon(Icons.link),
+            title: const Text('Link with Husband'),
+            subtitle: Text(userProfile.partnerName != null ? 'Linked to ${userProfile.partnerName}' : 'Not linked'),
+            trailing: const Icon(Icons.chevron_right),
+            onTap: () {
+              // TODO: Navigate to Link Screen or Show Dialog
+              ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Link feature coming soon!')));
+            },
+          ),
+          const Divider(),
           SwitchListTile(
             title: const Text('Share Moods'),
             value: userProfile.shareMoods,