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/components/screens/GameScreen.tsx

@@ -1,9 +1,10 @@
 "use client";
 
-import { motion } from "framer-motion";
+import { AnimatePresence, motion } from "framer-motion";
 import { useEffect, useRef, useState } from "react";
 import { GameTable } from "@/components/GameTable";
 import { PostMatchRewardsModal } from "@/components/online/PostMatchRewardsModal";
+import { MatchIntroOverlay } from "@/components/online/MatchIntroOverlay";
 import { useGameStore } from "@/lib/game-store";
 import { useSessionStore } from "@/lib/session-store";
 import { useUIStore } from "@/lib/ui-store";
@@ -24,6 +25,8 @@ export function GameScreen() {
   const forfeited = useGameStore((s) => s.forfeited);
   const forfeitRequest = useGameStore((s) => s.forfeitRequest);
   const respondForfeit = useGameStore((s) => s.respondForfeit);
+  const introPending = useGameStore((s) => s.matchIntroPending);
+  const consumeIntro = useGameStore((s) => s.consumeIntro);
   const returnTo = useUIStore((s) => s.returnTo);
   const go = useUIStore((s) => s.go);
   const refreshProfile = useSessionStore((s) => s.refreshProfile);
@@ -139,6 +142,13 @@ export function GameScreen() {
         onForfeit={canForfeit ? () => useGameStore.getState().forfeit() : undefined}
       />
 
+      {/* UNO-style "players joining the table" intro (online matches, once) */}
+      <AnimatePresence>
+        {introPending && mode === "online" && (
+          <MatchIntroOverlay onDone={consumeIntro} />
+        )}
+      </AnimatePresence>
+
       {/* teammate asked to forfeit — confirm or decline */}
       {forfeitRequest && (
         <motion.div