Match intro "players joining" loading screen + i18n fix; checkpoint

- MatchIntroOverlay: UNO-style pre-game reveal — the 4 seats animate into the
  table (with "?" placeholders until each player's data streams in for live
  matches), a 3-2-1-GO countdown, then the table shows. Wired via game-store
  matchIntroPending/consumeIntro, rendered online-only in GameScreen.
- Fix: intro.found / intro.getReady / intro.go existed only in the Persian dict;
  added the English strings (would have shown raw keys to EN users).
- Checkpoint of the in-progress UI/social batch (CoinsPill, shop titles section,
  friend-request rate limit, etc.) — all green.

Verified: tsc + next build + scripts/sim.ts + dotnet build server/Hokm.slnx all pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/game-store.ts

@@ -94,6 +94,8 @@ interface GameStore {
   forfeited: boolean;
   /** a teammate is asking to forfeit and needs your confirmation. */
   forfeitRequest: ForfeitRequest | null;
+  /** a fresh online match just started — play the "players joining the table" intro once. */
+  matchIntroPending: boolean;
 
   newMatch: (settings: GameSettings) => void;
   newOnlineMatch: (cfg: OnlineMatchConfig) => void;
@@ -109,6 +111,8 @@ interface GameStore {
   forfeit: () => void;
   /** Respond to a teammate's forfeit request. */
   respondForfeit: (confirm: boolean) => void;
+  /** Mark the match-intro reveal as played (so it doesn't replay on resume). */
+  consumeIntro: () => void;
   reset: () => void;
 }
 
@@ -334,6 +338,7 @@ export const useGameStore = create<GameStore>((set, get) => {
     paused: false,
     forfeited: false,
     forfeitRequest: null,
+    matchIntroPending: false,
 
     newMatch: (settings) => {
       clearPending();
@@ -376,6 +381,7 @@ export const useGameStore = create<GameStore>((set, get) => {
         paused: false,
         forfeited: false,
         forfeitRequest: null,
+        matchIntroPending: true,
         matchMeta: { ranked: cfg.ranked, stake: cfg.stake, speed: !!cfg.speed },
         tally: freshTally(),
         turnDeadline: null,
@@ -410,6 +416,7 @@ export const useGameStore = create<GameStore>((set, get) => {
         paused: false,
         forfeited: false,
         forfeitRequest: null,
+        matchIntroPending: true,
         matchMeta: { ranked: true, stake: 0, speed: false },
         tally: freshTally(),
         turnDeadline: null,
@@ -529,6 +536,8 @@ export const useGameStore = create<GameStore>((set, get) => {
       set({ forfeitRequest: null });
     },
 
+    consumeIntro: () => set({ matchIntroPending: false }),
+
     reset: () => {
       clearPending();
       if (liveUnsub) {
@@ -553,6 +562,7 @@ export const useGameStore = create<GameStore>((set, get) => {
         paused: false,
         forfeited: false,
         forfeitRequest: null,
+        matchIntroPending: false,
         seatPlayers: [],
         tally: freshTally(),
         turnDeadline: null,