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>

HANDOFF.md

@@ -63,7 +63,7 @@ npm run build                               # next static export
 - Online multiplayer over SignalR: matchmaking (pro skips queue, bots fill after wait), live server-run ranked games, server-authoritative entry/rewards. **Matchmaking waits ~15s (randomized 12–18s) for humans, then bots fill** (`GameManager.NextQueueWaitMs`; mock mirrors it in `beginSearch`). MatchmakingScreen shows the elapsed timer + a bot-fill hint.
 - **Per-league turn time** (think faster in higher leagues): Starter/vs-AI/private → **15s**, Pro (stake ≥500) → **10s**, Expert (stake ≥1000) → **7s**. Single source: `turnMsForStake(stake, speed?)` in `gamification.ts`; the live server mirrors it in `GameRoom.TurnMs`. The turn-timer bar reads it from `matchMeta.stake`.
 - **Speed (Blitz) mode** — CLIENT-ONLY (vs-AI + private rooms; ranked stays standard). Flat **5s** turn clock (`SPEED_TURN_MS`), races to **5** points (`SPEED_TARGET_SCORE`), and ~½ pacing on animations/pauses (the `fast()` scaler in `game-store.scheduleAuto`). Threaded via `matchMeta.speed` + `GameSettings.speed`/`OnlineMatchConfig.speed`. Toggle on Home's vs-Computer card; a `SpeedBadge` (⚡) shows on the table HUD. No server change needed — private rooms are client-driven even in live mode, and ranked is intentionally excluded.
-- **Economy:** coins; ranked entry = stake (win +stake [+kot 40], lose −stake); free vs-computer/private rooms. Buy-coins via **ZarinPal sandbox** (merchant `299685fb-cadf-4dfc-98e2-d4af5d81528d`, config-driven). Coin packs: starter 50k/95,000﷼, …  Stores (Bazaar/Myket) must use their **IAB** (`/api/coins/iab/verify` scaffolded; token verification TODO).
+- **Economy:** coins; ranked entry = stake (win +stake [+kot 40], lose −stake); free vs-computer/private rooms. Buy-coins via **ZarinPal sandbox** (merchant `299685fb-cadf-4dfc-98e2-d4af5d81528d`, config-driven) + store IAB. **⚠️ Economy is balanced as one system — keep ALL of these in sync client↔server when tuning** (`gamification.ts` ↔ `Profiles/Gamification.cs` + `ProfileService`): coin packs (`p1` 5,000c/99k﷼ · `p2` 12,000c/199k · `p3` 28,000c/399k · `p4` 65,000c/799k — a starter pack ≈ one premium cosmetic, NOT "buy everything"), item prices (cosmetics 600–6,000c, XP packs 1,500/4,000/8,000c), achievement coin reward `min(1500, max(50, round((40+goal·6)/50)·50))`, rank rewards 150/300/500/900/1500, daily `[100,150,200,300,400,600,1500]`. Stores (Bazaar/Myket) **IAB** — see §6.
 - **XP/levels:** every game grants XP, **winner ×2**; **premium (pro) ×1.5**; max level 100; curve `100*lvl + 15*lvl²`. **Store sells XP packs** (xp1 +200/5k, xp2 +600/12k, xp3 +1500/25k coins; consumable; unlocks level achievements).
 - **Achievements:** ~100, metric-driven generator (categories: victory/kot/streak/hakem/level/rank/veteran), incl. "7× hakem", "7–0 sweep". Dedicated **AchievementsScreen** (tabbed) + Profile summary. Some unlock **sticker packs**.
 - **Cosmetics:** avatars, titles (incl. expert/professional/captain/leader ladder), card **front**+**back**, reaction packs, **16 sticker packs** (all custom inline-SVG art in `Sticker.tsx`). **✨ Luxury tier** (premium giftable items): luxury avatars (🦢🎩💎💰🏆 + 💠 rank-gated), luxury card backs (Diamond/Black Gold/Platinum/Peacock/Rose-Gold) + fronts (Diamond/Black Gold), luxury titles (Hokm Sultan/Emperor/Grandmaster). Shop tags items priced ≥2000 with a gold **«ویژه/Luxury»** badge + ring.