fix(aigc): correct generated media preview handling

update ResultPreview component to use proper image and video result URLs
refine isVideo detection logic across detail and shared work pages
add pointer-events none to preview elements to avoid blocking user interactions
standardize media URL usage between AIGC detail and shared work components

src/pages-aigc/detail/detail.vue

@@ -65,7 +65,7 @@ const result = computed(() => {
 
   const imageUrl = record.imageResultUrl || "";
   const videoUrl = record.videoResultUrl || "";
-  const isVideo = Boolean(videoUrl) && (record.generatorType === 1 || !imageUrl);
+  const isVideo = Number(record.generatorType) === 1;
   const typeText = getMappedText(GENERATOR_TYPE_TEXT, record.generatorType, "类型");
   const statusText = getMappedText(TASK_STATUS_TEXT, record.taskStatus, "状态");
   const consumedText =
@@ -76,7 +76,9 @@ const result = computed(() => {
   return {
     id: record.taskId,
     title: record.itemTitle || record.taskId || "生成结果",
-    cover: isVideo ? videoUrl : imageUrl || videoUrl,
+    cover: isVideo ? videoUrl : imageUrl,
+    imageResultUrl: imageUrl,
+    videoResultUrl: videoUrl,
     mediaType: isVideo ? "video" : "image",
     accent: "#0a4d46",
     variantLabel: typeText,