fix(17): IN-03 render visible Redirecting status during OIDC redirect

apps/pwa/src/App.tsx

@@ -78,7 +78,23 @@ function OidcRedirect() {
   useEffect(() => {
     window.location.replace('/api/login');
   }, []);
-  return <div aria-hidden="true" />;
+  // IN-03: render a perceivable status (not an empty aria-hidden div) so the
+  // transition is announced to screen-reader/keyboard users if the redirect is slow.
+  return (
+    <div
+      role="status"
+      style={{
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+        minHeight: '100vh',
+        color: 'var(--color-text-muted, #6b7280)',
+        fontSize: '0.95rem',
+      }}
+    >
+      Redirecting to sign in…
+    </div>
+  );
 }
 
 export default function App() {