show reading progress in author page. Allow deletion of tags, even if assigned to story.

frontend/src/app/settings/tag-maintenance/page.tsx

@@ -120,26 +120,27 @@ export default function TagMaintenancePage() {
 
   const handleDeleteSelected = async () => {
     if (selectedTagIds.size === 0) return;
-    
+
     const confirmation = confirm(
       `Are you sure you want to delete ${selectedTagIds.size} selected tag(s)? This action cannot be undone.`
     );
-    
+
     if (!confirmation) return;
-    
+
     try {
-      const deletePromises = Array.from(selectedTagIds).map(tagId => 
+      const deletePromises = Array.from(selectedTagIds).map(tagId =>
         tagApi.deleteTag(tagId)
       );
-      
+
       await Promise.all(deletePromises);
-      
+
       // Reload tags and reset selection
       await loadTags();
       setSelectedTagIds(new Set());
-    } catch (error) {
+    } catch (error: any) {
       console.error('Failed to delete tags:', error);
-      alert('Failed to delete some tags. Please try again.');
+      const errorMessage = error.response?.data?.error || error.message || 'Failed to delete some tags. Please try again.';
+      alert(errorMessage);
     }
   };