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/hooks/useEconomy.ts

@@ -1,93 +0,0 @@
-// useEconomy.ts — Hook React avec lazy calculation + localStorage
-// Pas de setInterval pour les gains passifs — tout est calculé au read
-
-import { useState, useCallback, useEffect } from "react";
-import {
-  GameState,
-  DEFAULT_STATE,
-  applyIdleGains,
-  applyClick,
-  buyGenerator,
-  applyPrestige,
-  canPrestige,
-  totalProductionPerSecond,
-  generatorCost,
-} from "../core/economy";
-
-const SAVE_KEY = "clickerz_state";
-
-function loadState(): GameState {
-  try {
-    const raw = localStorage.getItem(SAVE_KEY);
-    if (!raw) return { ...DEFAULT_STATE, lastTick: Date.now() };
-    const saved = JSON.parse(raw) as GameState;
-    // Appliquer les gains idle accumulés pendant l'absence
-    return applyIdleGains(saved, Date.now());
-  } catch {
-    return { ...DEFAULT_STATE, lastTick: Date.now() };
-  }
-}
-
-function saveState(state: GameState): void {
-  localStorage.setItem(SAVE_KEY, JSON.stringify(state));
-}
-
-export function useEconomy() {
-  const [state, setState] = useState<GameState>(loadState);
-
-  // Auto-save + tick UI toutes les secondes (pour rafraîchir l'affichage uniquement)
-  // La vraie valeur est calculée lazily dans totalProductionPerSecond
-  useEffect(() => {
-    const id = setInterval(() => {
-      setState((prev) => {
-        const updated = applyIdleGains(prev, Date.now());
-        saveState(updated);
-        return updated;
-      });
-    }, 1000);
-    return () => clearInterval(id);
-  }, []);
-
-  const click = useCallback(() => {
-    setState((prev) => {
-      const updated = applyClick(applyIdleGains(prev, Date.now()));
-      saveState(updated);
-      return updated;
-    });
-  }, []);
-
-  const buy = useCallback((genId: string) => {
-    setState((prev) => {
-      const withIdle = applyIdleGains(prev, Date.now());
-      const updated = buyGenerator(withIdle, genId);
-      if (!updated) return prev;
-      saveState(updated);
-      return updated;
-    });
-  }, []);
-
-  const prestige = useCallback(() => {
-    setState((prev) => {
-      if (!canPrestige(prev)) return prev;
-      const updated = applyPrestige(prev);
-      saveState(updated);
-      return updated;
-    });
-  }, []);
-
-  const reset = useCallback(() => {
-    const fresh = { ...DEFAULT_STATE, lastTick: Date.now() };
-    saveState(fresh);
-    setState(fresh);
-  }, []);
-
-  return {
-    state,
-    click,
-    buy,
-    prestige,
-    canPrestige: canPrestige(state),
-    productionPerSecond: totalProductionPerSecond(state),
-    generatorCost,
-  };
-}