[Accessibility] Manage focus on navigation (#39350)

app/javascript/mastodon/actions/modal.ts

@@ -10,6 +10,7 @@ interface OpenModalPayload {
   modalType: ModalType;
   modalProps: ModalProps;
   previousModalProps?: ModalProps;
+  ignoreFocus?: boolean;
 }
 export const openModal = createAction<OpenModalPayload>('MODAL_OPEN');