Add E2E tests for internationalization across multiple pages

- Implemented navigation.spec.ts to test language switching and translation of navigation elements.
- Created sessions-page.spec.ts to verify translations on the sessions page, including headers, status badges, and date formatting.
- Developed settings-page.spec.ts to ensure settings page content is translated and persists across sessions.
- Added skills-page.spec.ts to validate translations for skill categories, action buttons, and empty states.

ccw/frontend/src/locales/zh/skills.json

@@ -0,0 +1,42 @@
+{
+  "title": "技能",
+  "description": "管理和配置技能",
+  "source": {
+    "builtin": "内置",
+    "custom": "自定义",
+    "community": "社区"
+  },
+  "actions": {
+    "viewDetails": "查看详情",
+    "configure": "配置",
+    "enable": "启用",
+    "disable": "禁用",
+    "toggle": "切换",
+    "install": "安装技能"
+  },
+  "state": {
+    "enabled": "已启用",
+    "disabled": "已禁用",
+    "on": "开启",
+    "off": "关闭"
+  },
+  "card": {
+    "triggers": "触发器",
+    "category": "类别",
+    "author": "作者",
+    "version": "版本"
+  },
+  "filters": {
+    "all": "全部",
+    "enabled": "已启用",
+    "disabled": "已禁用"
+  },
+  "view": {
+    "grid": "网格视图",
+    "compact": "紧凑视图"
+  },
+  "emptyState": {
+    "title": "未找到技能",
+    "message": "没有符合当前筛选条件的技能。"
+  }
+}