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

frontend/src/components/tags/TagEditModal.tsx

@@ -129,7 +129,8 @@ export default function TagEditModal({ tag, isOpen, onClose, onSave, onDelete }:
       onDelete(tag);
       onClose();
     } catch (error: any) {
-      setErrors({ submit: error.message });
+      const errorMessage = error.response?.data?.error || error.message || 'Failed to delete tag';
+      setErrors({ submit: errorMessage });
     } finally {
       setSaving(false);
     }