fix(ui): 优化提供商详情页的交互体验

- 模型列表删除按钮仅在 hover 时显示红色
- 批量关联模型对话框：只有全局模型时展开，有多个分组时全部折叠

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

@@ -178,7 +178,7 @@
                 <Button
                   variant="ghost"
                   size="icon"
-                  class="h-8 w-8 text-destructive hover:text-destructive"
+                  class="h-8 w-8 hover:text-destructive"
                   title="删除"
                   @click="deleteModel(model)"
                 >