알림팝업 전체닫기 오류 수정

frontend/src/components/TradeSignalSnackbar.tsx

@@ -93,8 +93,17 @@ export const TradeSignalSnackbar: React.FC<Props> = ({
     setPageIndex(p => Math.min(totalPages - 1, p + 1));
   }, [totalPages]);
 
+  const dismissAll = useCallback(() => {
+    dismissAllToasts();
+    setPageIndex(0);
+    positionsRef.current = {};
+  }, [dismissAllToasts]);
+
   const dismissCurrentPage = useCallback(() => {
     dismissToasts(pageItems.map(i => i.id));
+    positionsRef.current = Object.fromEntries(
+      Object.entries(positionsRef.current).filter(([id]) => !pageItems.some(p => p.id === id)),
+    );
   }, [dismissToasts, pageItems]);
 
   const handleDragStart = useCallback((e: React.PointerEvent, key: string) => {
@@ -219,7 +228,7 @@ export const TradeSignalSnackbar: React.FC<Props> = ({
           <button
             type="button"
             className="tsn-dismiss-all"
-            onClick={dismissAllToasts}
+            onClick={dismissAll}
             title={`대기 중인 알림 ${toastNotifications.length}건 전체 닫기`}
           >
             전체닫기 ({toastNotifications.length})