chore(mosaic): document OAuth modal restoration gap

Author: austincalvelage

packages/mosaic/src/features/user-profile/__tests__/user-profile-connected-accounts.feature.test.tsx

@@ -997,4 +997,7 @@ describe('connected accounts', () => {
   it.todo('keeps the provider visibly pending when Try again replaces its failed account with a Connect row');
   // TODO: Revisit sharing connected-account scope and reconnect helpers with the legacy UI.
   // TODO: Stop awaiting Mosaic navigation once routing has an agreed lifecycle and a redirect cancellation signal.
+  // TODO: Restore the UserProfile modal after OAuth returns. `mode` currently only preserves
+  // legacy callback URL state. When the Mosaic modal host is wired up, consider replacing
+  // `mode` with an optional host callback that prepares the redirect URL.
 });