feat: add tests and implementation for issue discovery and queue pages

- Implemented `DiscoveryPage` with session management and findings display.
- Added tests for `DiscoveryPage` to ensure proper rendering and functionality.
- Created `QueuePage` for managing issue execution queues with stats and actions.
- Added tests for `QueuePage` to verify UI elements and translations.
- Introduced `useIssues` hooks for fetching and managing issue data.
- Added loading skeletons and error handling for better user experience.
- Created `vite-env.d.ts` for TypeScript support in Vite environment.

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

@@ -23,13 +23,19 @@
   "card": {
     "triggers": "触发器",
     "category": "类别",
+    "source": "来源",
     "author": "作者",
     "version": "版本"
   },
   "filters": {
     "all": "全部",
     "enabled": "已启用",
-    "disabled": "已禁用"
+    "disabled": "已禁用",
+    "searchPlaceholder": "搜索技能...",
+    "allSources": "所有来源"
+  },
+  "stats": {
+    "totalSkills": "总技能数"
   },
   "view": {
     "grid": "网格视图",