fix custom shape in viewer

src/pages/viewer/utils/dataTransformer.ts

@@ -50,6 +50,8 @@ type ViewerDataPage = {
     isMask?: boolean;
     maskId?: string;
     maskInvert?: boolean;
+    points?: number[];
+    closed?: boolean;
   }>;
 };
 
@@ -165,6 +167,19 @@ export function transformViewerDataToPages(data: ViewerData): PageData[] {
         baseObject.maskInvert = obj.maskInvert;
       }
 
+      if (obj.type === "custom-shape") {
+        if (obj.points !== undefined) baseObject.points = obj.points;
+        if (obj.closed !== undefined) baseObject.closed = obj.closed;
+        // Older custom shapes stored Konva opacity (0–1) instead of 0–100
+        if (
+          obj.opacity !== undefined &&
+          obj.opacity > 0 &&
+          obj.opacity <= 1
+        ) {
+          baseObject.opacity = obj.opacity * 100;
+        }
+      }
+
       return baseObject;
     });