fix(router): adjust type check for extra parameter in navigation

fix(import): ensure correct typing for passing markdown and imageUrl
fix(recipes): delete local image file on recipe deletion to avoid orphan files

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

@@ -78,8 +78,9 @@ class _RecipeImportTabState extends ConsumerState<RecipeImportTab> {
             );
 
       if (!mounted) return;
-      // Pass both markdown and imageUrl so CreateRecipeScreen can pre-fill both.
-      context.push('/recipes/create', extra: {
+      // Explicitly typed as <String, dynamic> so the router's
+      // 'is Map<String, dynamic>' runtime check succeeds.
+      context.push('/recipes/create', extra: <String, dynamic>{
         'markdown': result.markdown,
         'imageUrl': result.imageUrl,
       });