[디테일] 하단 구매 토스트 노출 관련수정

- 디테일 상단 백버튼에 포커스가면 clearAllToasts 처리.

com.twin.app.shoptime/src/views/DetailPanel/components/THeaderCustom.jsx

@@ -28,6 +28,7 @@ export default function THeaderCustom({
   onBackButton,
   onSpotlightUp,
   onSpotlightLeft,
+  onBackButtonFocus,
   marqueeDisabled = true,
   onClick,
   ariaLabel,
@@ -65,12 +66,19 @@ export default function THeaderCustom({
     }
   };
 
+  const _onBackButtonFocus = useCallback(() => {
+    if(onBackButtonFocus){
+      onBackButtonFocus();
+    }
+  },[onBackButtonFocus])
+
   return (
     <Container className={classNames(css.tHeaderCustom, className)} {...rest}>
       {onBackButton && (
         <SpottableComponent
           className={css.button}
           onClick={_onClick}
+          onFocus={_onBackButtonFocus}
           spotlightId={"spotlightId_backBtn"}
           onSpotlightUp={_onSpotlightUp}
           onSpotlightLeft={_onSpotlightLeft}