feat: Add validation viewing functionality and UI updates

- Implemented a new function to mark validations as viewed by the user, updating the validation state accordingly.
- Added a new API endpoint for marking validations as viewed, integrated with the existing GitHub routes.
- Enhanced the sidebar to display the count of unviewed validations, providing real-time updates.
- Updated the GitHub issues view to mark validations as viewed when issues are accessed, improving user interaction.
- Introduced a visual indicator for unviewed validations in the issue list, enhancing user awareness of pending validations.

apps/server/src/routes/github/index.ts

@@ -14,6 +14,7 @@ import {
   createValidationStopHandler,
   createGetValidationsHandler,
   createDeleteValidationHandler,
+  createMarkViewedHandler,
 } from './routes/validation-endpoints.js';
 
 export function createGitHubRoutes(events: EventEmitter): Router {
@@ -41,6 +42,11 @@ export function createGitHubRoutes(events: EventEmitter): Router {
     validatePathParams('projectPath'),
     createDeleteValidationHandler()
   );
+  router.post(
+    '/validation-mark-viewed',
+    validatePathParams('projectPath'),
+    createMarkViewedHandler()
+  );
 
   return router;
 }