style: 完整展示资产详情图片并移除底部边线

src/features/project-assets/AssetLibraryPage.vue

@@ -412,7 +412,7 @@ async function removeAsset() {
                         :src="selectedAsset.publicUrl"
                         :alt="selectedAsset.name"
                         preview
-                        object-fit="cover"
+                        object-fit="contain"
                         class="asset-management-preview"
                     />
                     <div class="asset-management-fields">
@@ -552,7 +552,7 @@ async function removeAsset() {
     @apply min-w-0 break-all text-ink;
 }
 .asset-management-footer {
-    @apply flex items-center justify-between gap-3 mt-5 pt-4 border-t border-(--app-border);
+    @apply flex items-center justify-between gap-3 mt-5 pt-4;
 }
 @container asset-library (max-width: 840px) {
     .asset-library-filters {