feat: integrate thinking level support across various components

- Enhanced multiple server and UI components to include an optional thinking level parameter, improving the configurability of model interactions.
- Updated request handlers and services to manage and pass the thinking level, ensuring consistent data handling across the application.
- Refactored UI components to display and manage the selected model along with its thinking level, enhancing user experience and clarity.
- Adjusted the Electron API and HTTP client to support the new thinking level parameter in requests, ensuring seamless integration.

This update significantly improves the application's ability to adapt reasoning capabilities based on user-defined thinking levels, enhancing overall performance and user satisfaction.

apps/ui/src/components/views/github-issues-view.tsx

@@ -31,6 +31,9 @@ export function GitHubIssuesView() {
   // Model override for validation
   const validationModelOverride = useModelOverride({ phase: 'validationModel' });
 
+  // Extract model string for API calls (backward compatibility)
+  const validationModelString = validationModelOverride.effectiveModel;
+
   const { openIssues, closedIssues, loading, refreshing, error, refresh } = useGithubIssues();
 
   const { validatingIssues, cachedValidations, handleValidateIssue, handleViewCachedValidation } =