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/components/ResultPreview/index.vue

@@ -3,11 +3,12 @@
     <video
       v-if="result.mediaType === 'video'"
       class="result-preview-image"
-      :src="result.cover"
+      :src="result.videoResultUrl"
+      :poster="result.imageResultUrl"
       controls
       object-fit="cover"
     />
-    <image v-else class="result-preview-image" :src="result.cover" mode="aspectFill" />
+    <image v-else class="result-preview-image" :src="result.imageResultUrl" mode="aspectFill" />
     <view class="result-preview-shade" />
 
     <view class="result-preview-caption">

src/pages-aigc/detail/components/ResultPreview/styles/index.scss

@@ -31,6 +31,7 @@
     rgba(0, 0, 0, 0.16) 48%,
     rgba(0, 0, 0, 0.74) 100%
   );
+  pointer-events: none;
 }
 
 .result-preview-caption {
@@ -38,6 +39,7 @@
   right: 18px;
   bottom: 18px;
   left: 18px;
+  pointer-events: none;
 }
 
 .result-preview-badge {