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/ui/src/components/layout/sidebar/hooks/use-navigation.ts

@@ -44,6 +44,8 @@ interface UseNavigationProps {
   setIsProjectPickerOpen: (value: boolean | ((prev: boolean) => boolean)) => void;
   cyclePrevProject: () => void;
   cycleNextProject: () => void;
+  /** Count of unviewed validations to show on GitHub Issues nav item */
+  unviewedValidationsCount?: number;
 }
 
 export function useNavigation({
@@ -61,6 +63,7 @@ export function useNavigation({
   setIsProjectPickerOpen,
   cyclePrevProject,
   cycleNextProject,
+  unviewedValidationsCount,
 }: UseNavigationProps) {
   // Track if current project has a GitHub remote
   const [hasGitHubRemote, setHasGitHubRemote] = useState(false);
@@ -169,6 +172,7 @@ export function useNavigation({
             id: 'github-issues',
             label: 'Issues',
             icon: CircleDot,
+            count: unviewedValidationsCount,
           },
           {
             id: 'github-prs',
@@ -180,7 +184,15 @@ export function useNavigation({
     }
 
     return sections;
-  }, [shortcuts, hideSpecEditor, hideContext, hideTerminal, hideAiProfiles, hasGitHubRemote]);
+  }, [
+    shortcuts,
+    hideSpecEditor,
+    hideContext,
+    hideTerminal,
+    hideAiProfiles,
+    hasGitHubRemote,
+    unviewedValidationsCount,
+  ]);
 
   // Build keyboard shortcuts for navigation
   const navigationShortcuts: KeyboardShortcut[] = useMemo(() => {