fix(ticket): stabilize detection preview index during loading

src/app/(modules)/ticket/[ticketId]/components/TicketClassDetectionPreview.tsx

@@ -121,6 +121,7 @@ export function TicketClassDetectionPreview({
   );
   const detectionResult = detectionsQuery.data;
   const activeDetection = detectionResult?.items[0];
+  const confirmedDetectionCount = detectionResult?.total;
   const detectionCount =
     detectionResult?.total ?? (assignmentId ? 0 : (totalCount ?? 0));
   const activeVisual = getDefectVisual(
@@ -136,15 +137,20 @@ export function TicketClassDetectionPreview({
   );
 
   useEffect(() => {
-    if (detectionCount === 0 && currentIndex !== 0) {
+    if (confirmedDetectionCount === undefined) return;
+
+    if (confirmedDetectionCount === 0 && currentIndex !== 0) {
       setCurrentIndex(0);
       return;
     }
 
-    if (detectionCount > 0 && currentIndex > detectionCount - 1) {
-      setCurrentIndex(detectionCount - 1);
+    if (
+      confirmedDetectionCount > 0 &&
+      currentIndex > confirmedDetectionCount - 1
+    ) {
+      setCurrentIndex(confirmedDetectionCount - 1);
     }
-  }, [currentIndex, detectionCount]);
+  }, [confirmedDetectionCount, currentIndex]);
 
   const isNavigationDisabled =
     detectionCount === 0 || detectionsQuery.isLoading;