feat(profile): account-deletion flow + terminal deleted screen

Profile gains a Delete-account control (durable accounts) opening a step-up dialog: a
mailed code for an email account, or the typed DELETE phrase for a platform-only one.
On success the app swaps to a terminal AccountDeleted screen ('Учётная запись удалена')
with a Close that closes the host Mini App (telegramClose / vkClose; web = no close).
Wires deleteRequest/deleteConfirm through client/transport/mock/codec; ru/en i18n;
codec wire test + Chromium/WebKit e2e.

ui/src/lib/telegram.ts

@@ -36,6 +36,7 @@ interface TelegramWebApp {
   contentSafeAreaInset?: { top: number; bottom: number; left: number; right: number };
   ready?: () => void;
   expand?: () => void;
+  close?: () => void;
   openTelegramLink?: (url: string) => void;
   openLink?: (url: string) => void;
   onEvent?: (event: string, handler: () => void) => void;
@@ -84,6 +85,12 @@ export function insideTelegram(): boolean {
   return !!w && typeof w.initData === 'string' && w.initData.length > 0;
 }
 
+/** telegramClose closes the Mini App (Telegram.WebApp.close), used on the terminal
+ *  account-deleted screen. A no-op outside Telegram. */
+export function telegramClose(): void {
+  webApp()?.close?.();
+}
+
 // The ?NN suffix pins the Bot API SDK version Telegram serves (and busts the cache); keep it at the
 // version the official Mini Apps page currently recommends so newer client features (fullscreen,
 // safe-area insets, vertical-swipe guard, …) are available. Bump it when Telegram bumps theirs.