feat: Implement auto-scrolling to the first validation error in the create diet form and refine image validation logic.

lib/features/create_diet/presentation/create_diet_screen.dart

@@ -58,6 +58,39 @@ class _CreateDietScreenContentState extends State<CreateDietScreenContent> {
   final GlobalKey<MarkdownEditorState> _mdKey = GlobalKey<MarkdownEditorState>();
   bool _mdToolbarVisible = false;
 
+  final GlobalKey _nameKey = GlobalKey();
+  final GlobalKey _durationKey = GlobalKey();
+  final GlobalKey _statusKey = GlobalKey();
+  final GlobalKey _typeKey = GlobalKey();
+  final GlobalKey _imageKey = GlobalKey();
+  final GlobalKey _planKey = GlobalKey();
+
+  void _scrollToFirstError(CreateDietState state) {
+    GlobalKey? key;
+    if (state.dietNameError != null) {
+      key = _nameKey;
+    } else if (state.dietDescriptionError != null) {
+      key = _mdKey;
+    } else if (state.dietDurationError != null) {
+      key = _durationKey;
+    } else if (state.dietStateError != null) {
+      key = _statusKey;
+    } else if (state.dietImageError != null) {
+      key = _imageKey;
+    } else if (state.dailyScheduleErrors.any((e) => e.isNotEmpty)) {
+      key = _planKey;
+    }
+
+    if (key != null && key.currentContext != null) {
+      Scrollable.ensureVisible(
+        key.currentContext!,
+        duration: const Duration(milliseconds: 500),
+        curve: Curves.easeInOut,
+        alignment: 0.1,
+      );
+    }
+  }
+
   @override
   void initState() {
     super.initState();
@@ -118,6 +151,7 @@ class _CreateDietScreenContentState extends State<CreateDietScreenContent> {
                     children: [
                       const SizedBox(height: 16),
                       CustomTextFormField(
+                        key: _nameKey,
                         hintText: s.enter_diet_name,
                         controller: nameController,
                         hasError: state.dietNameError != null,
@@ -143,19 +177,20 @@ class _CreateDietScreenContentState extends State<CreateDietScreenContent> {
                       ),
                       if (state.dietDescriptionError != null) ...[const SizedBox(height: 4), ValidationErrorWidget(error: state.dietDescriptionError ?? '')],
                       const SizedBox(height: 12),
-                      const DietDurationDropDownWidget(),
+                      DietDurationDropDownWidget(key: _durationKey),
                       const SizedBox(height: 12),
-                      StatusDropDownWidget(dietState: widget.diet?.state),
+                      StatusDropDownWidget(key: _statusKey, dietState: widget.diet?.state),
                       const SizedBox(height: 16),
-                      const DietTypeChoiceWidget(),
+                      DietTypeChoiceWidget(key: _typeKey),
                       const SizedBox(height: 16),
-                      const DietImagePickerWidget(),
+                      DietImagePickerWidget(key: _imageKey),
                       const SizedBox(height: 16),
                     ],
                   ),
                 ),
                 const SizedBox(height: 16),
                 MainBackgroundBouble(
+                  key: _planKey,
                   child: Padding(
                     padding: const EdgeInsets.symmetric(vertical: 16.0),
                     child: Center(
@@ -185,7 +220,11 @@ class _CreateDietScreenContentState extends State<CreateDietScreenContent> {
                             ? () {}
                             : () async {
                                 final diet = await context.read<CreateDietCubit>().getDietForPreview();
-                                if (diet == null) return;
+                                if (diet == null) {
+                                  // ignore: use_build_context_synchronously
+                                  _scrollToFirstError(context.read<CreateDietCubit>().state);
+                                  return;
+                                }
                                 if (!context.mounted) return;
                                 GoRouter.of(context).pushNamed(DietPreviewScreen.name, extra: diet);
                               },
@@ -204,7 +243,10 @@ class _CreateDietScreenContentState extends State<CreateDietScreenContent> {
                         CustomOutlinedButton(
                           onPressed: () async {
                             final result = await context.read<CreateDietCubit>().createDiet();
-                            if (result == 'error') {
+                            if (result == 'validation') {
+                              // ignore: use_build_context_synchronously
+                              _scrollToFirstError(context.read<CreateDietCubit>().state);
+                            } else if (result == 'error') {
                               if (!context.mounted) return;
                               showErrorDialog(context, title: '${s.could_not_publish_diet} ${state.dietData.name}');
                             }

lib/features/create_diet/presentation/cubit/create_diet_cubit.dart

@@ -394,11 +394,11 @@ class CreateDietCubit extends Cubit<CreateDietState> {
       result = false;
       emit(state.copyWith(dietStateError: 'Статус диеты не выбран'));
     }
-    if (state.dietData.image == null) {
+    if (state.dietData.image == null && state.dietData.imageUrl == null) {
       result = false;
       emit(state.copyWith(dietImageError: 'Не добавлена обложка'));
     }
-    result = _isDailyScheduleValid();
+    result = _isDailyScheduleValid() && result;
     return result;
   }