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/codec.test.ts

@@ -27,6 +27,8 @@ import {
   encodeEnqueue,
   encodeExchange,
   encodeExportUrlRequest,
+  encodeAccountDeleteConfirm,
+  decodeDeleteRequestResult,
   encodeGuestLogin,
   encodeLinkUnlink,
   encodeStateRequest,
@@ -464,6 +466,21 @@ describe('codec', () => {
     expect(r.kind()).toBe('telegram');
   });
 
+  it('round-trips the account-delete confirm + request-result wire', () => {
+    const c = fb.AccountDeleteConfirm.getRootAsAccountDeleteConfirm(
+      new ByteBuffer(encodeAccountDeleteConfirm('123456', 'DELETE')),
+    );
+    expect(c.code()).toBe('123456');
+    expect(c.phrase()).toBe('DELETE');
+
+    const b = new Builder(32);
+    const m = b.createString('email');
+    fb.AccountDeleteRequestResult.startAccountDeleteRequestResult(b);
+    fb.AccountDeleteRequestResult.addMethod(b, m);
+    b.finish(fb.AccountDeleteRequestResult.endAccountDeleteRequestResult(b));
+    expect(decodeDeleteRequestResult(b.asUint8Array()).method).toBe('email');
+  });
+
   it('passes an unlinked / changed LinkResult status straight through', () => {
     for (const status of ['unlinked', 'changed'] as const) {
       const b = new Builder(64);