fix: block right-click pointerdown from reaching dnd-kit

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/dashboard/TaskCard.tsx

@@ -175,6 +175,13 @@ export function TaskCard({
         {...dragAttributes}
         {...dragListeners}
         className="bg-white rounded-2xl px-5 py-3 mb-3 shadow-sm border border-gray-100 hover:shadow-md hover:border-gray-200 transition-all select-none h-[112px] cursor-grab active:cursor-grabbing overflow-hidden"
+        onPointerDown={(e) => {
+          // 우클릭(button !== 0)을 dnd-kit에 전달하지 않음
+          // dnd-kit은 pointerdown→pointerup 시 synthetic click을 발화하는데
+          // 이것이 우클릭에도 적용되어 상세창이 열리는 원인
+          if (e.button !== 0) return;
+          dragListeners?.onPointerDown?.(e);
+        }}
         onClick={onCardClick}
         onContextMenu={handleContextMenu}
       >