fix: report API errors (422, 404, 5xx, network) and React errors to Forgejo error reporter

- client.ts: logError() import added, API error interceptor now reports to /api/v1/errors
- ErrorBoundary.tsx: logError() import added, React rendering errors now reported
- 401 (auth) and 403 (permission) errors are NOT reported (expected behavior)
- 422 (validation), 404 (not found), 5xx (server), 0 (network) ARE reported

frontend/src/components/ErrorBoundary.tsx

@@ -1,4 +1,5 @@
 import React from 'react';
+import { logError } from '@/utils/errorLogger';
 
 interface ErrorBoundaryProps {
   children: React.ReactNode;
@@ -26,6 +27,7 @@ export class ErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoun
 
   componentDidCatch(error: Error, errorInfo: React.ErrorInfo): void {
     console.error('[ErrorBoundary] Uncaught error:', error, errorInfo);
+    logError(error, { componentStack: errorInfo.componentStack, source: 'ErrorBoundary' });
   }
 
   handleReload = (): void => {