Enhance video playback cubit resilience and K-12 curriculum flow

apps/student_app/lib/presentation/screens/home/unified_home_screen.dart

@@ -10,6 +10,7 @@ import '../../../data/models/lesson_model.dart';
 import '../../../logic/cubits/auth_cubit.dart';
 import '../../../logic/cubits/dashboard_cubits.dart';
 import '../../widgets/luxury_widgets.dart';
+import '../curriculum/subjects_grid_screen.dart';
 
 class UnifiedHomeScreen extends StatefulWidget {
   final UserModel user;
@@ -209,13 +210,43 @@ class _UnifiedHomeScreenState extends State<UnifiedHomeScreen> {
           );
         } else if (state is StudentEmpty) {
           return Center(
-            child: Column(
-              mainAxisAlignment: MainAxisAlignment.center,
-              children: [
-                const Icon(CupertinoIcons.book, color: AppColors.textMutedDark, size: 48),
-                const SizedBox(height: 12),
-                Text(AppStrings.noLessonsFound, style: const TextStyle(color: AppColors.textSecondaryDark)),
-              ],
+            child: Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 24),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  Container(
+                    width: 72,
+                    height: 72,
+                    decoration: BoxDecoration(
+                      color: AppColors.saqelCyan.withAlpha(25),
+                      shape: BoxShape.circle,
+                      border: Border.all(color: AppColors.saqelCyan.withAlpha(80), width: 1.5),
+                    ),
+                    child: const Icon(CupertinoIcons.book_fill, color: AppColors.saqelCyan, size: 36),
+                  ),
+                  const SizedBox(height: 18),
+                  const Text(
+                    'المنهاج الوزاري المعتمد — صَقِل 🇯🇴',
+                    style: TextStyle(color: Colors.white, fontSize: 18, fontWeight: FontWeight.w800),
+                  ),
+                  const SizedBox(height: 8),
+                  const Text(
+                    'اختر من بين 16 مبحثاً دراسياً لبدء شروحات الفيديو التفاعلية، أوراق العمل، وبنك الأسئلة السقراطي',
+                    textAlign: TextAlign.center,
+                    style: TextStyle(color: AppColors.textSecondaryDark, fontSize: 13, height: 1.4),
+                  ),
+                  const SizedBox(height: 24),
+                  LuxuryButton(
+                    text: 'تصفح المناهج والمواد 📚',
+                    onPressed: () {
+                      Navigator.of(context).push(
+                        MaterialPageRoute(builder: (_) => SubjectsGridScreen(initialGrade: widget.user.gradeLevel)),
+                      );
+                    },
+                  ),
+                ],
+              ),
             ),
           );
         } else if (state is StudentLoaded) {
@@ -224,6 +255,69 @@ class _UnifiedHomeScreenState extends State<UnifiedHomeScreen> {
             child: ListView(
               padding: const EdgeInsets.all(20),
               children: [
+                // Subjects Catalog Banner (Top Gateway)
+                InkWell(
+                  onTap: () {
+                    Navigator.of(context).push(
+                      MaterialPageRoute(builder: (_) => SubjectsGridScreen(initialGrade: widget.user.gradeLevel)),
+                    );
+                  },
+                  borderRadius: BorderRadius.circular(20),
+                  child: Container(
+                    padding: const EdgeInsets.all(18),
+                    decoration: BoxDecoration(
+                      gradient: const LinearGradient(
+                        colors: [Color(0xFF0F2B48), Color(0xFF0A192F)],
+                        begin: Alignment.topLeft,
+                        end: Alignment.bottomRight,
+                      ),
+                      borderRadius: BorderRadius.circular(20),
+                      border: Border.all(color: AppColors.saqelCyan.withAlpha(100), width: 1.5),
+                      boxShadow: [
+                        BoxShadow(
+                          color: AppColors.saqelCyan.withAlpha(30),
+                          blurRadius: 20,
+                          offset: const Offset(0, 6),
+                        ),
+                      ],
+                    ),
+                    child: Row(
+                      children: [
+                        Container(
+                          width: 48,
+                          height: 48,
+                          decoration: BoxDecoration(
+                            gradient: const LinearGradient(
+                              colors: [AppColors.appleBlue, AppColors.saqelCyan],
+                            ),
+                            borderRadius: BorderRadius.circular(14),
+                          ),
+                          child: const Icon(CupertinoIcons.square_grid_2x2_fill, color: Colors.black, size: 24),
+                        ),
+                        const SizedBox(width: 14),
+                        const Expanded(
+                          child: Column(
+                            crossAxisAlignment: CrossAxisAlignment.start,
+                            children: [
+                              Text(
+                                'تصفح المناهج والمواد (16 مادة) 📚',
+                                style: TextStyle(color: Colors.white, fontWeight: FontWeight.w800, fontSize: 15),
+                              ),
+                              SizedBox(height: 4),
+                              Text(
+                                'الرياضيات، الفيزياء، الإنجليزي، الكيمياء، والمزيد',
+                                style: TextStyle(color: AppColors.textSecondaryDark, fontSize: 12),
+                              ),
+                            ],
+                          ),
+                        ),
+                        const Icon(CupertinoIcons.chevron_back, color: AppColors.saqelCyan, size: 18),
+                      ],
+                    ),
+                  ),
+                ),
+                const SizedBox(height: 20),
+
                 // Real Readiness Score Card
                 LuxuryCard(
                   borderColor: AppColors.saqelCyan.withAlpha(50),