feat: 侧边卡片设置页视觉重构——分组容器卡片、计数徽标、自定义开关、加宽设置弹窗（描述 + 完成按钮），卡片齿轮与勾选徽标纵向对齐同尺寸

src/client/locales.ts

@@ -106,6 +106,9 @@ export const zh = {
   copyAbsolute: '复制绝对地址',
   download: '下载',
   settingsNav: '侧边卡片',
+  settingsIntro: '管理侧边卡片的显示内容与默认行为',
+  settingsPopupDesc: '为「{feature}」配置相关选项',
+  settingsDone: '完成',
   settingsOpenTitle: '新会话默认打开',
   settingsOpenDesc: '新建会话时自动展开侧边卡片；已存在的会话保持各自布局',
   settingsWidthTitle: '默认宽度占比',
@@ -307,6 +310,9 @@ export const en: Record<keyof typeof zh, string> = {
   copyAbsolute: 'Copy absolute path',
   download: 'Download',
   settingsNav: 'Side card',
+  settingsIntro: 'Manage what the side card shows and how it behaves',
+  settingsPopupDesc: 'Configure related options for {feature}',
+  settingsDone: 'Done',
   settingsOpenTitle: 'Open by default for new conversations',
   settingsOpenDesc: 'Expand the side card automatically for brand-new conversations; existing conversations keep their own layouts',
   settingsWidthTitle: 'Default width share',