refactor(css): 优化公共样式和布局

- 新增 .br12 类，用于设置 12 像素的圆角
- 调整 .container 样式，移除多余的注释
- 优化内容编辑区域的样式，使其更加美观
- 统一操作选项弹窗的样式和结构
- 调整矩阵问题和文本带图问题的样式
- 优化选择问题和可拖拽组件的样式- 更新设计页面和创建问卷页面的样式
- 移除未使用的 ElCol 和 ElRow 组件引用
- 新增 VanGrid 和 VanGridItem 组件引用

components.d.ts

@@ -9,13 +9,11 @@ declare module 'vue' {
   export interface GlobalComponents {
     Contenteditable: typeof import('./src/components/contenteditable.vue')['default']
     ElButton: typeof import('element-plus/es')['ElButton']
-    ElCol: typeof import('element-plus/es')['ElCol']
     ElDropdown: typeof import('element-plus/es')['ElDropdown']
     ElDropdownItem: typeof import('element-plus/es')['ElDropdownItem']
     ElDropdownMenu: typeof import('element-plus/es')['ElDropdownMenu']
     ElInput: typeof import('element-plus/es')['ElInput']
     ElOption: typeof import('element-plus/es')['ElOption']
-    ElRow: typeof import('element-plus/es')['ElRow']
     ElSelect: typeof import('element-plus/es')['ElSelect']
     ElSpace: typeof import('element-plus/es')['ElSpace']
     ElText: typeof import('element-plus/es')['ElText']
@@ -31,6 +29,8 @@ declare module 'vue' {
     VanCol: typeof import('vant/es')['Col']
     VanDivider: typeof import('vant/es')['Divider']
     VanField: typeof import('vant/es')['Field']
+    VanGrid: typeof import('vant/es')['Grid']
+    VanGridItem: typeof import('vant/es')['GridItem']
     VanIcon: typeof import('vant/es')['Icon']
     VanNavBar: typeof import('vant/es')['NavBar']
     VanPicker: typeof import('vant/es')['Picker']
@@ -38,9 +38,12 @@ declare module 'vue' {
     VanRadio: typeof import('vant/es')['Radio']
     VanRadioGroup: typeof import('vant/es')['RadioGroup']
     VanRow: typeof import('vant/es')['Row']
+    VanSearch: typeof import('vant/es')['Search']
     VanStepper: typeof import('vant/es')['Stepper']
     VanSwitch: typeof import('vant/es')['Switch']
     VanTab: typeof import('vant/es')['Tab']
+    VanTabbar: typeof import('vant/es')['Tabbar']
+    VanTabbarItem: typeof import('vant/es')['TabbarItem']
     VanTabs: typeof import('vant/es')['Tabs']
     YLCascader: typeof import('./src/components/YLCascader.vue')['default']
     YLInput: typeof import('./src/components/YLInput.vue')['default']