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/hooks/index.ts

@@ -70,6 +70,8 @@ export {
   useUpdateIssue,
   useDeleteIssue,
   useIssueMutations,
+  useQueueMutations,
+  useIssueDiscovery,
   issuesKeys,
 } from './useIssues';
 export type {
@@ -79,6 +81,9 @@ export type {
   UseCreateIssueReturn,
   UseUpdateIssueReturn,
   UseDeleteIssueReturn,
+  UseQueueMutationsReturn,
+  FindingFilters,
+  UseIssueDiscoveryReturn,
 } from './useIssues';
 
 // ========== Skills ==========