fix(provider): remove stale image preview block from model test dialog

frontend/src/features/providers/components/provider-tabs/ModelTestDialog.vue

@@ -393,39 +393,6 @@
         </div>
       </div>
 
-      <div
-        v-if="resultImagePreviews.length > 0"
-        class="rounded-lg border border-border/60 bg-muted/20 p-3 space-y-3"
-      >
-        <div class="flex items-center justify-between gap-3 text-xs text-muted-foreground">
-          <span>图片预览</span>
-          <span>{{ resultImagePreviews.length }} 张</span>
-        </div>
-        <div class="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
-          <button
-            v-for="(preview, index) in resultImagePreviews"
-            :key="`${preview.src}-${index}`"
-            type="button"
-            class="group overflow-hidden rounded-md border border-border/60 bg-background text-left transition-colors hover:border-primary/60 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-primary/70"
-            :title="preview.label"
-            @click="openImagePreview(preview)"
-          >
-            <div class="aspect-square w-full overflow-hidden bg-muted/30">
-              <img
-                :src="preview.src"
-                :alt="preview.label"
-                class="h-full w-full object-contain"
-                loading="lazy"
-              >
-            </div>
-            <div class="flex items-center justify-between gap-2 border-t border-border/60 px-2 py-1 text-[11px] text-muted-foreground">
-              <span>{{ preview.label }}</span>
-              <span>{{ preview.source === 'base64' ? 'base64' : 'URL' }}</span>
-            </div>
-          </button>
-        </div>
-      </div>
-
       <div
         v-if="shouldCollapseAttempts"
         class="flex items-center justify-between gap-3 text-xs text-muted-foreground"
@@ -1296,12 +1263,6 @@ const resultImageAttempt = computed(() => {
     ?? null
 })
 
-const resultImagePreviews = computed(() => (
-  resultImageAttempt.value
-    ? extractModelTestImagePreviews(resultImageAttempt.value.response_body)
-    : []
-))
-
 const resultWinningTitle = computed(() => {
   const summary = resultSummary.value
   const keyName = summary.winning_key_name || summary.winning_key_id