fix: resolve lint error and typecheck failures for MVP launch readiness

- Remove unused `registerUser` import in e2e/api/inquiries.spec.ts
- Add `override` modifier to class methods in query-provider.tsx

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/components/providers/query-provider.tsx

@@ -37,13 +37,13 @@ class QueryErrorBoundaryInner extends Component<
   { children: ReactNode; onReset: () => void },
   ErrorBoundaryState
 > {
-  state: ErrorBoundaryState = { error: null };
+  override state: ErrorBoundaryState = { error: null };
 
   static getDerivedStateFromError(error: Error) {
     return { error };
   }
 
-  componentDidCatch(error: Error, info: ErrorInfo) {
+  override componentDidCatch(error: Error, info: ErrorInfo) {
     if (process.env.NODE_ENV !== 'production') {
       console.error('Query error boundary caught:', error, info);
     }
@@ -54,7 +54,7 @@ class QueryErrorBoundaryInner extends Component<
     this.setState({ error: null });
   };
 
-  render() {
+  override render() {
     if (this.state.error) {
       return <QueryErrorFallback error={this.state.error} reset={this.reset} />;
     }