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/transport.ts

@@ -277,6 +277,12 @@ export function createTransport(baseUrl: string): GatewayClient {
     async changeEmailConfirm(email, code) {
       return codec.decodeLinkResult(await exec('link.email.change.confirm', codec.encodeLinkEmailConfirm(email, code)));
     },
+    async deleteRequest() {
+      return codec.decodeDeleteRequestResult(await exec('account.delete.request', codec.empty()));
+    },
+    async deleteConfirm(code, phrase) {
+      await exec('account.delete.confirm', codec.encodeAccountDeleteConfirm(code, phrase));
+    },
     async statsGet() {
       return codec.decodeStats(await exec('stats.get', codec.empty()));
     },