Stage 17 (#4): in-memory lobby cache — render instantly on the back-slide, refresh in background

ui/src/lib/app.svelte.ts

@@ -13,6 +13,7 @@ import { insideTelegram, onTelegramPath, telegramColorScheme, telegramLaunch, te
 import { parseStartParam } from './deeplink';
 import { clearSession, loadPrefs, loadSession, saveSession, savePrefs } from './session';
 import { clearGameCache } from './gamecache';
+import { clearLobby } from './lobbycache';
 import type { BoardLabelMode } from './boardlabels';
 
 export interface Toast {
@@ -311,6 +312,7 @@ export async function loginEmail(email: string, code: string): Promise<void> {
 export async function logout(): Promise<void> {
   closeStream();
   clearGameCache();
+  clearLobby();
   gateway.setToken(null);
   await clearSession();
   app.session = null;