fix: particule clic affiche le vrai gain (clickMult × prestigeMult × treeMult)

Ajout getClickGain() dans economy.ts — utilisé par la particule de feedback
et le cockpit header "Ponte". Avant : affichait toujours +1.

Frontend/src/components/CockpitHeader.tsx

@@ -2,11 +2,13 @@
 
 import { useGameStore } from "../store/useGameStore";
 import { formatNumber } from "../utils/formatNumber";
+import { getClickGain } from "../core/economy";
 
 export function CockpitHeader() {
   const productionPerSecond = useGameStore((s) => s.productionPerSecond);
-  const { clickMultiplier, prestigeMultiplier, ancestralDna, prestigeCount } =
-    useGameStore((s) => s.state);
+  const state = useGameStore((s) => s.state);
+  const { prestigeMultiplier, ancestralDna, prestigeCount } = state;
+  const clickGain = getClickGain(state);
 
   return (
     <div className="gp gp-cockpit-header">
@@ -18,7 +20,7 @@ export function CockpitHeader() {
       </div>
       <div className="gp-stat">
         <span className="gp-label">Ponte</span>
-        <span className="gp-value">x{clickMultiplier}</span>
+        <span className="gp-value">{formatNumber(clickGain)}</span>
       </div>
       <div className="gp-stat">
         <span className="gp-label">Mult</span>

Frontend/src/core/economy.ts

@@ -129,10 +129,15 @@ export function applyIdleGains(state: GameState, now: number): GameState {
   };
 }
 
+// Gain réel par clic (pour affichage particule)
+export function getClickGain(state: GameState): number {
+  const treeClickMult = getClickMultiplierFromTree(state.evolutionTree);
+  return state.clickMultiplier * state.prestigeMultiplier * treeClickMult;
+}
+
 // Clic manuel
 export function applyClick(state: GameState): GameState {
-  const treeClickMult = getClickMultiplierFromTree(state.evolutionTree);
-  const gain = state.clickMultiplier * state.prestigeMultiplier * treeClickMult;
+  const gain = getClickGain(state);
   return {
     ...state,
     resources: state.resources + gain,

Frontend/src/pages/Home.jsx

@@ -4,6 +4,7 @@ import { useEffect, useCallback } from "react";
 
 import { useGameStore } from "../store/useGameStore";
 import { formatNumber } from "../utils/formatNumber";
+import { getClickGain } from "../core/economy";
 import { GeneratorShop } from "../components/GeneratorShop";
 import { PrestigePanel } from "../components/PrestigePanel";
 import { EvolutionTree } from "../components/EvolutionTree";
@@ -17,19 +18,20 @@ export default function Home() {
   const [toggleRain] = useOutletContext();
   const click = useGameStore((s) => s.click);
   const resources = useGameStore((s) => s.state.resources);
-  const clickMultiplier = useGameStore((s) => s.state.clickMultiplier);
+  const state = useGameStore((s) => s.state);
+  const clickGain = getClickGain(state);
 
   const createParticle = useCallback((clientX, clientY) => {
     const particle = document.createElement("span");
     particle.className = "click-particle";
-    particle.textContent = `+${formatNumber(clickMultiplier)}`;
+    particle.textContent = `+${formatNumber(clickGain)}`;
     particle.style.left = `${clientX}px`;
     particle.style.top = `${clientY}px`;
     document.body.appendChild(particle);
     setTimeout(() => {
       if (particle.parentNode) particle.parentNode.removeChild(particle);
     }, 800);
-  }, [clickMultiplier]);
+  }, [clickGain]);
 
   const handleIncrement = useCallback((e) => {
     click();