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

lib/screens/home/home_screen.dart

@@ -12,11 +12,13 @@ import '../devotional/devotional_screen.dart';
 import '../settings/appearance_screen.dart';
 import '../settings/cycle_settings_screen.dart';
 import '../settings/relationship_settings_screen.dart';
-import '../settings/goal_settings_screen.dart'; // Add this
+import '../settings/goal_settings_screen.dart'; 
 import '../settings/cycle_history_screen.dart';
 import '../settings/sharing_settings_screen.dart';
 import '../settings/notification_settings_screen.dart';
+import '../settings/privacy_settings_screen.dart';
 import '../settings/supplies_settings_screen.dart';
+import '../settings/export_data_screen.dart';
 import '../learn/wife_learn_screen.dart'; 
 import '../../widgets/tip_card.dart';
 import '../../widgets/cycle_ring.dart';
@@ -36,19 +38,47 @@ class HomeScreen extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final selectedIndex = ref.watch(navigationProvider);
     final isPadTrackingEnabled = ref.watch(userProfileProvider.select((u) => u?.isPadTrackingEnabled ?? false));
-    final isSingle = ref.watch(userProfileProvider.select((u) => u?.relationshipStatus == RelationshipStatus.single));
 
-    final tabs = [
-      const _DashboardTab(),
-      const CalendarScreen(),
-      const LogScreen(),
-      if (isPadTrackingEnabled) const PadTrackerScreen(),
-      const DevotionalScreen(),
-      const WifeLearnScreen(),
-      _SettingsTab(
-          onReset: () =>
-              ref.read(navigationProvider.notifier).setIndex(0)),
-    ];
+    final List<Widget> tabs;
+    final List<BottomNavigationBarItem> navBarItems;
+
+    if (isPadTrackingEnabled) {
+      tabs = [
+        const _DashboardTab(),
+        const CalendarScreen(),
+        const PadTrackerScreen(),
+        const LogScreen(),
+        const DevotionalScreen(),
+        const WifeLearnScreen(),
+        _SettingsTab(onReset: () => ref.read(navigationProvider.notifier).setIndex(0)),
+      ];
+      navBarItems = [
+        const BottomNavigationBarItem(icon: Icon(Icons.home_outlined), activeIcon: Icon(Icons.home), label: 'Home'),
+        const BottomNavigationBarItem(icon: Icon(Icons.calendar_today_outlined), activeIcon: Icon(Icons.calendar_today), label: 'Calendar'),
+        const BottomNavigationBarItem(icon: Icon(Icons.inventory_2_outlined), activeIcon: Icon(Icons.inventory_2), label: 'Supplies'),
+        const BottomNavigationBarItem(icon: Icon(Icons.add_circle_outline), activeIcon: Icon(Icons.add_circle), label: 'Log'),
+        const BottomNavigationBarItem(icon: Icon(Icons.menu_book_outlined), activeIcon: Icon(Icons.menu_book), label: 'Devotional'),
+        const BottomNavigationBarItem(icon: Icon(Icons.school_outlined), activeIcon: Icon(Icons.school), label: 'Learn'),
+        const BottomNavigationBarItem(icon: Icon(Icons.settings_outlined), activeIcon: Icon(Icons.settings), label: 'Settings'),
+      ];
+    } else {
+      tabs = [
+        const _DashboardTab(),
+        const CalendarScreen(),
+        const DevotionalScreen(),
+        const LogScreen(),
+        const WifeLearnScreen(),
+        _SettingsTab(onReset: () => ref.read(navigationProvider.notifier).setIndex(0)),
+      ];
+      navBarItems = [
+        const BottomNavigationBarItem(icon: Icon(Icons.home_outlined), activeIcon: Icon(Icons.home), label: 'Home'),
+        const BottomNavigationBarItem(icon: Icon(Icons.calendar_today_outlined), activeIcon: Icon(Icons.calendar_today), label: 'Calendar'),
+        const BottomNavigationBarItem(icon: Icon(Icons.menu_book_outlined), activeIcon: Icon(Icons.menu_book), label: 'Devotional'),
+        const BottomNavigationBarItem(icon: Icon(Icons.add_circle_outline), activeIcon: Icon(Icons.add_circle), label: 'Log'),
+        const BottomNavigationBarItem(icon: Icon(Icons.school_outlined), activeIcon: Icon(Icons.school), label: 'Learn'),
+        const BottomNavigationBarItem(icon: Icon(Icons.settings_outlined), activeIcon: Icon(Icons.settings), label: 'Settings'),
+      ];
+    }
 
     return Scaffold(
       body: IndexedStack(
@@ -73,44 +103,7 @@ class HomeScreen extends ConsumerWidget {
           currentIndex: selectedIndex >= tabs.length ? 0 : selectedIndex,
           onTap: (index) =>
               ref.read(navigationProvider.notifier).setIndex(index),
-          items: [
-            const BottomNavigationBarItem(
-              icon: Icon(Icons.home_outlined),
-              activeIcon: Icon(Icons.home),
-              label: 'Home',
-            ),
-            const BottomNavigationBarItem(
-              icon: Icon(Icons.calendar_today_outlined),
-              activeIcon: Icon(Icons.calendar_today),
-              label: 'Calendar',
-            ),
-            const BottomNavigationBarItem(
-              icon: Icon(Icons.add_circle_outline),
-              activeIcon: Icon(Icons.add_circle),
-              label: 'Log',
-            ),
-            if (isPadTrackingEnabled)
-              const BottomNavigationBarItem(
-                icon: Icon(Icons.inventory_2_outlined),
-                activeIcon: Icon(Icons.inventory_2),
-                label: 'Supplies',
-              ),
-            const BottomNavigationBarItem(
-              icon: Icon(Icons.menu_book_outlined),
-              activeIcon: Icon(Icons.menu_book),
-              label: 'Devotional',
-            ),
-            const BottomNavigationBarItem(
-              icon: Icon(Icons.school_outlined),
-              activeIcon: Icon(Icons.school),
-              label: 'Learn',
-            ),
-            const BottomNavigationBarItem(
-              icon: Icon(Icons.settings_outlined),
-              activeIcon: Icon(Icons.settings),
-              label: 'Settings',
-            ),
-          ],
+          items: navBarItems,
         ),
       ),
     );
@@ -528,7 +521,14 @@ class _SettingsTab extends ConsumerWidget {
                 'My Favorites',
                 onTap: () => _showFavoritesDialog(context, ref),
               ),
-              _buildSettingsTile(context, Icons.lock_outline, 'Privacy'),
+              _buildSettingsTile(
+                  context, Icons.security, 'Privacy & Security',
+                  onTap: () {
+                Navigator.push(
+                    context,
+                    MaterialPageRoute(
+                        builder: (context) => const PrivacySettingsScreen()));
+              }),
               if (!isSingle)
                 _buildSettingsTile(
                   context,
@@ -538,7 +538,8 @@ class _SettingsTab extends ConsumerWidget {
                     Navigator.push(
                         context,
                         MaterialPageRoute(
-                            builder: (context) => SharingSettingsScreen()));
+                            builder: (context) =>
+                                const SharingSettingsScreen()));
                   },
                 ),
             ]),
@@ -561,7 +562,13 @@ class _SettingsTab extends ConsumerWidget {
                         builder: (context) => CycleHistoryScreen()));
               }),
               _buildSettingsTile(
-                  context, Icons.download_outlined, 'Export Data'),
+                  context, Icons.download_outlined, 'Export Data',
+                  onTap: () {
+                Navigator.push(
+                    context,
+                    MaterialPageRoute(
+                        builder: (context) => const ExportDataScreen()));
+              }),
             ]),
             const SizedBox(height: 16),
             _buildSettingsGroup(context, 'Account', [
@@ -605,14 +612,54 @@ class _SettingsTab extends ConsumerWidget {
     );
   }
 
-  void _showFavoritesDialog(BuildContext context, WidgetRef ref) {
+  Future<bool> _authenticate(BuildContext context, String correctPin) async {
+    final controller = TextEditingController();
+    final pin = await showDialog<String>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Enter PIN'),
+        content: TextField(
+          controller: controller,
+          keyboardType: TextInputType.number,
+          obscureText: true,
+          maxLength: 4,
+          textAlign: TextAlign.center,
+          style: const TextStyle(fontSize: 24, letterSpacing: 8),
+          decoration: const InputDecoration(hintText: '....'),
+          autofocus: true,
+        ),
+        actions: [
+          TextButton(onPressed: () => Navigator.pop(context), child: const Text('Cancel')),
+          ElevatedButton(
+            onPressed: () => Navigator.pop(context, controller.text),
+            child: const Text('Unlock'),
+          ),
+        ],
+      ),
+    );
+    return pin == correctPin;
+  }
+
+  void _showFavoritesDialog(BuildContext context, WidgetRef ref) async {
     final userProfile = ref.read(userProfileProvider);
     if (userProfile == null) return;
 
+    if (userProfile.isBioProtected && userProfile.privacyPin != null) {
+      final granted = await _authenticate(context, userProfile.privacyPin!);
+      if (!granted) {
+        if (context.mounted) {
+           ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Incorrect PIN')));
+        }
+        return;
+      }
+    }
+
     final controller = TextEditingController(
       text: userProfile.favoriteFoods?.join(', ') ?? '',
     );
 
+    if (!context.mounted) return;
+
     showDialog(
       context: context,
       builder: (context) => AlertDialog(