fix(ui): prevent modal overlays from inheriting margin-top from parent space-y containers

frontend/src/features/triage/TaskDetailModal.tsx

@@ -163,7 +163,7 @@ export const TaskDetailModal: React.FC<TaskDetailModalProps> = ({
   const subtasksPercent = subtasks.length > 0 ? Math.round((completedSubtasks / subtasks.length) * 100) : 0;
 
   return (
-    <div className="fixed inset-0 modal-overlay z-50 flex items-center justify-center p-3 sm:p-4 overflow-y-auto">
+    <div className="fixed inset-0 !m-0 modal-overlay z-50 flex items-center justify-center p-3 sm:p-4 overflow-y-auto">
       <div
         className="w-full max-w-2xl panel-surface shadow-panel border border-border my-auto flex flex-col max-h-[92vh] overflow-hidden"
         onClick={(e) => e.stopPropagation()}