Resolve all lints and deprecation warnings

lib/screens/husband/husband_devotional_screen.dart

@@ -8,6 +8,7 @@ import '../../providers/user_provider.dart';
 import '../../theme/app_theme.dart';
 import '../../services/bible_xml_parser.dart';
 import '../../services/mock_data_service.dart';
+import '../../services/notification_service.dart';
 
 class HusbandDevotionalScreen extends ConsumerStatefulWidget {
   const HusbandDevotionalScreen({super.key});
@@ -190,11 +191,11 @@ class _HusbandDevotionalScreenState
                 // Trigger notification for new teaching plans
                 if (existingPlan == null) {
                   NotificationService().showTeachingPlanNotification(
-                    teacherName: user.name ?? 'Husband',
+                    teacherName: user.name,
                   );
                 }
 
-                if (mounted) Navigator.pop(context);
+                if (context.mounted) Navigator.pop(context);
               },
               child: const Text('Save'),
             ),
@@ -283,7 +284,7 @@ class _HusbandDevotionalScreenState
                 decoration: BoxDecoration(
                   color: Colors.white,
                   borderRadius: BorderRadius.circular(16),
-                  border: Border.all(color: Colors.grey.withOpacity(0.2)),
+                  border: Border.all(color: Colors.grey.withValues(alpha: 0.2)),
                 ),
                 child: Column(
                   children: [
@@ -314,7 +315,7 @@ class _HusbandDevotionalScreenState
                     background: Container(
                       alignment: Alignment.centerRight,
                       padding: const EdgeInsets.only(right: 20),
-                      color: Colors.red.withOpacity(0.8),
+                      color: Colors.red.withValues(alpha: 0.8),
                       child: const Icon(Icons.delete, color: Colors.white),
                     ),
                     onDismissed: (_) => _deletePlan(plan),
@@ -517,14 +518,14 @@ class _HusbandDevotionalScreenState
       decoration: BoxDecoration(
         gradient: LinearGradient(
           colors: [
-            AppColors.lavender.withOpacity(0.15),
-            AppColors.blushPink.withOpacity(0.15),
+            AppColors.lavender.withValues(alpha: 0.15),
+            AppColors.blushPink.withValues(alpha: 0.15),
           ],
           begin: Alignment.topLeft,
           end: Alignment.bottomRight,
         ),
         borderRadius: BorderRadius.circular(16),
-        border: Border.all(color: AppColors.lavender.withOpacity(0.3)),
+        border: Border.all(color: AppColors.lavender.withValues(alpha: 0.3)),
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -623,12 +624,12 @@ class _HusbandDevotionalScreenState
               width: double.infinity,
               padding: const EdgeInsets.all(16),
               decoration: BoxDecoration(
-                color: Colors.white.withOpacity(0.5),
+                color: Colors.white.withValues(alpha: 0.5),
                 borderRadius: BorderRadius.circular(12),
               ),
               child: Column(
                 children: [
-                  Icon(Icons.favorite_border,
+                  const Icon(Icons.favorite_border,
                       color: AppColors.warmGray, size: 32),
                   const SizedBox(height: 8),
                   Text(
@@ -642,7 +643,7 @@ class _HusbandDevotionalScreenState
                     'Check back later or encourage her to share.',
                     style: GoogleFonts.outfit(
                       fontSize: 12,
-                      color: AppColors.warmGray.withOpacity(0.8),
+                      color: AppColors.warmGray.withValues(alpha: 0.8),
                     ),
                   ),
                 ],
@@ -660,8 +661,8 @@ class _HusbandDevotionalScreenState
     showDialog(
       context: context,
       builder: (context) => AlertDialog(
-        title: Row(
-          children: const [
+        title: const Row(
+          children: [
             Icon(Icons.link, color: AppColors.navyBlue),
             SizedBox(width: 8),
             Text('Connect with Wife'),
@@ -723,12 +724,14 @@ class _HusbandDevotionalScreenState
                       .updateProfile(updatedProfile);
                 }
 
-                ScaffoldMessenger.of(context).showSnackBar(
-                  const SnackBar(
-                    content: Text('Connected with wife! 💑'),
-                    backgroundColor: AppColors.sageGreen,
-                  ),
-                );
+                if (context.mounted) {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(
+                      content: Text('Connected with wife! 💑'),
+                      backgroundColor: AppColors.sageGreen,
+                    ),
+                  );
+                }
               }
             },
             style: ElevatedButton.styleFrom(