Store XP packs (expensive), winner 2x XP, premium perks

- XP packs in the store (coin-priced, intentionally expensive): xp1 200/5k,
  xp2 600/12k, xp3 1500/25k. Consumable (grant XP, can level up) — server
  ShopBuy handles kind "xp" via an authoritative XpPacks map + Gamification.GrantXp;
  mock mirrors. New shop section + shop.xp/xpHint i18n.
- Every game grants XP and the WINNER earns 2x: matchXp is now
  base*(won?2:1)*leagueFactor (was a flat +80 win bonus). Mirrored server-side.
- Premium (pro) perks: 1.5x XP multiplier (applied in applyMatchResult /
  ApplyMatch by plan), plus animated shimmering gold chat bubbles for your own
  messages (premium-chat CSS; ChatScreen gates on plan).

Verified: tsc + next + dotnet build clean; sim passes; live server — buying xp2
took L1→L3 and deducted 12k coins under the new curve. Images rebuilt :1500/:1505.

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

src/lib/online/gamification.ts

@@ -130,6 +130,13 @@ export function leagueById(id: string): MatchLeague {
   return MATCH_LEAGUES.find((l) => l.id === id) ?? MATCH_LEAGUES[0];
 }
 
+/** Coin-priced XP packs (XP is intentionally expensive). Server-authoritative. */
+export const XP_PACKS: { id: string; xp: number; price: number }[] = [
+  { id: "xp1", xp: 200, price: 5000 },
+  { id: "xp2", xp: 600, price: 12000 },
+  { id: "xp3", xp: 1500, price: 25000 },
+];
+
 /* ------------------------------- XP ---------------------------------- */
 
 /** Hard level cap. */
@@ -149,13 +156,13 @@ export function leagueXpFactor(stake: number): number {
   return 1;
 }
 
+/** XP multiplier for premium (pro) players. */
+export const PREMIUM_XP_MULT = 1.5;
+
 export function matchXp(summary: MatchSummary): number {
-  const base =
-    40 +
-    (summary.won ? 80 : 0) +
-    summary.tricksWon * 5 +
-    (summary.kotFor ? 30 : 0);
-  return Math.round(base * leagueXpFactor(summary.stake));
+  // Every game grants XP; the winner earns double.
+  const base = 40 + summary.tricksWon * 5 + (summary.kotFor ? 30 : 0);
+  return Math.round(base * (summary.won ? 2 : 1) * leagueXpFactor(summary.stake));
 }
 
 export interface LevelProgress {
@@ -557,7 +564,8 @@ export function applyMatchResult(
   const ratingAfter = Math.max(0, ratingBefore + rDelta);
 
   const cDelta = coinDelta(summary);
-  const xpGain = matchXp(summary);
+  // Premium (pro) players earn a multiple of XP.
+  const xpGain = Math.round(matchXp(summary) * (profile.plan === "pro" ? PREMIUM_XP_MULT : 1));
   const lvl = addXp(profile.level, profile.xp, xpGain);
 
   const stats = applyStats(profile.stats, summary);