feat(profile): carry linked identities in the profile (email, telegram, vk)

Add email / telegram_linked / vk_linked to the Profile (fbs table + regenerated
Go/TS bindings, gateway ProfileResp + encodeProfile, backend DTO, UI model +
decode). They are filled outside the pure projection — Server.profileResponse now
reads the account's identities (like the banner seam) — and will drive the profile's
Add / Unlink / change-email controls.

ui/src/lib/codec.ts

@@ -354,6 +354,9 @@ export function decodeProfile(buf: Uint8Array): Profile {
     notificationsInAppOnly: p.notificationsInAppOnly(),
     variantPreferences: decodeVariantPreferences(p),
     banner: decodeBanner(p),
+    email: s(p.email()),
+    telegramLinked: p.telegramLinked(),
+    vkLinked: p.vkLinked(),
   };
 }
 

ui/src/lib/mock/data.ts

@@ -39,6 +39,9 @@ export const PROFILE: Profile = {
   notificationsInAppOnly: true,
   // Every variant enabled, so the mock-driven UI offers the full New Game picker.
   variantPreferences: ['erudit_ru', 'scrabble_ru', 'scrabble_en'],
+  email: 'you@example.com',
+  telegramLinked: false,
+  vkLinked: false,
 };
 
 // Seed social/account data for the mock (pnpm start + Playwright). The mock profile

ui/src/lib/model.ts

@@ -156,6 +156,11 @@ export interface Profile {
   variantPreferences: Variant[];
   /** The advertising-banner block, present only for a viewer eligible to see it. */
   banner?: Banner;
+  /** The account's confirmed email address ("" when none). */
+  email: string;
+  /** Whether a Telegram / VK identity is attached — drives the Add / Unlink controls. */
+  telegramLinked: boolean;
+  vkLinked: boolean;
 }
 
 /** Banner is the advertising-banner block of an eligible viewer's profile. */