feat(import): enhance recipe creation by passing both markdown and image URL from import

flutter/lib/features/import/presentation/recipe_import_tab.dart

@@ -78,8 +78,11 @@ class _RecipeImportTabState extends ConsumerState<RecipeImportTab> {
             );
 
       if (!mounted) return;
-      // Pass markdown as GoRouter extra — CreateRecipeScreen picks it up.
-      context.push('/recipes/create', extra: result.markdown);
+      // Pass both markdown and imageUrl so CreateRecipeScreen can pre-fill both.
+      context.push('/recipes/create', extra: {
+        'markdown': result.markdown,
+        'imageUrl': result.imageUrl,
+      });
     } catch (e) {
       if (!mounted) return;
       setState(() => _error = mapErrorToUserMessage(e, context));