feat(sprint1-step5): migration Tailwind v4 + Zustand — suppression WildCoinContext

- Install tailwindcss @tailwindcss/vite zustand
- useGameStore.ts : Zustand store wrappant economy.ts (tick, click, buy, prestige, buyNode, loadFromServer)
- GameTick.tsx : composant timer 1s
- GeneratorShop.tsx : boutique générateurs Tailwind (remplace Amelioration.jsx)
- EvolutionTree, PrestigePanel, MilestoneBar : rewrite Zustand + Tailwind
- Hud.jsx : rewrite Zustand + Tailwind (suppression Hud.scss)
- BoutiqueCard, Achievements : migrés vers Zustand
- Supprimé : WildCoin/ (4 fichiers), timer/Timer.jsx, useEconomy.ts, Hud.scss
- WildCoinProvider retiré de main.jsx

Frontend/src/pages/Achievements.jsx

@@ -1,14 +1,14 @@
 import { useState } from "react";
 import AchievementsCard from "../components/AchievementsCard";
 import "../scss/achievements.scss";
-import { useWildCoin } from "../components/WildCoin/WildCoinContext";
+import { useGameStore } from "../store/useGameStore";
 import achievements from "../data/Achievements.json";
 
 function Achievements() {
-  const { wildCoin } = useWildCoin();
+  const resources = useGameStore((s) => s.state.resources);
   let score = 1;
-  if (wildCoin >= 25) {
-    score = Math.floor((wildCoin - 25) / 400) + 1;
+  if (resources >= 25) {
+    score = Math.floor((resources - 25) / 400) + 1;
   } else {
     score = 0;
   }