feat: click panel breakdown + guide updated

ClickPanel in Production tab — full click breakdown:
- Gain per click with formula (base × prestige × tree)
- Double Ponte chance (+ how to unlock if not)
- Crit Ponte chance (+ how to unlock if not)
- Auto-Ponte rate + effective prod/s
- Hint to invest in Ponte branch when no tree bonuses

Guide updated with 11 sections:
- Ponte (clic) section — breakdown, double/crit/auto explained
- Generateurs section — effective prod, multi-buy, share bars
- Prestige section — quadratic scaling formula explained
- Arbre section — 3 branches + convergence detailed
- Capstones section — all 3 + convergence alpha/omega

Frontend/src/lib/core/economy.ts

@@ -617,6 +617,35 @@ export function getClickGain(state: GameState): number {
   return state.clickMultiplier * state.prestigeMultiplier * treeClickMult;
 }
 
+// Breakdown complet du clic (pour affichage cockpit)
+export interface ClickBreakdown {
+  base: number;
+  prestigeMult: number;
+  treeMult: number;
+  total: number;
+  doubleChance: number;    // 0-1
+  critChance: number;      // 0-1
+  autoClicksPerSec: number;
+  effectivePerSec: number; // total × (1 + double × 1 + crit × 9) + autoClicks × total
+}
+
+export function getClickBreakdown(state: GameState): ClickBreakdown {
+  const base = state.clickMultiplier;
+  const prestigeMult = state.prestigeMultiplier;
+  const treeMult = getClickMultiplierFromTree(state.evolutionTree);
+  const total = base * prestigeMult * treeMult;
+  const doubleChance = getDoubleClickChance(state.evolutionTree);
+  const critChance = getCritClickChance(state.evolutionTree);
+  const autoClicksPerSec = getAutoClicksPerSecond(state.evolutionTree);
+
+  // Expected value per click = total × (1 + doubleChance × 1 + critChance × 9)
+  const expectedPerClick = total * (1 + doubleChance + critChance * 9);
+  // Auto-clicks produce total per auto-click (no double/crit on auto)
+  const effectivePerSec = autoClicksPerSec * total;
+
+  return { base, prestigeMult, treeMult, total, doubleChance, critChance, autoClicksPerSec, effectivePerSec };
+}
+
 export interface ClickResult {
   state: GameState;
   gain: number;