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/src/core/a2ui/A2UIWebSocketHandler.ts

@@ -161,7 +161,7 @@ export class A2UIWebSocketHandler {
     // Convert to QuestionAnswer format
     const questionAnswer: QuestionAnswer = {
       questionId: answer.questionId,
-      value: answer.value,
+      value: answer.value as string | boolean | string[],
       cancelled: answer.cancelled,
     };