style: 优化文件列表卡片的悬停交互动画效果

src/routes/admin/files/+page.svelte

@@ -204,8 +204,12 @@
 		flex-direction: column;
 	}
 
-	.file-card:hover {
+	.file-card:hover .file-preview img {
-		border-color: var(--accent-color);
+		transform: scale(1.05);
+	}
+
+	.file-card:hover .file-icon {
+		transform: scale(1.1);
 	}
 
 	.file-preview {
@@ -222,10 +226,12 @@
 		width: 100%;
 		height: 100%;
 		object-fit: cover;
+		transition: transform 0.3s ease;
 	}
 
 	.file-icon {
 		color: var(--text-muted);
+		transition: transform 0.3s ease;
 	}
 
 	.file-info {