feat: click gain scales with passive production (+1% of prod/s)

clickGain = base × prestige × tree × (1 + prod/s × 0.01)

At 3.1k/s passive: 10 × 32 = 320 per click instead of 10.
Clicking stays relevant as production grows — always ~1% of prod/s
worth per click. ClickPanel shows the prod multiplier in breakdown.

Frontend/src/lib/components/ClickPanel.svelte

@@ -14,17 +14,15 @@
 </script>
 
 <CollapsiblePanel title="Ponte (clic)" badge="{formatNumber(expected)}" accentClass="gp-accent-amber" defaultOpen={false}>
-	<!-- Expected value -->
+	<!-- Gain par clic -->
 	<div class="gp-row gp-row--active">
 		<div class="flex flex-col flex-1">
-			<span class="gp-value">Valeur attendue par clic</span>
+			<span class="gp-value">Gain par clic</span>
 			<span class="gp-label">
-				{formatNumber(b.total)} base
-				{#if b.doubleChance > 0} + {(b.doubleChance * 100).toFixed(0)}% double{/if}
-				{#if b.critChance > 0} + {(b.critChance * 100).toFixed(0)}% crit x10{/if}
+				x{b.prestigeMult.toFixed(1)} prestige · x{b.treeMult.toFixed(0)} arbre · x{b.prodBonus.toFixed(1)} prod
 			</span>
 		</div>
-		<span class="gp-value gp-accent-amber text-lg!">{formatNumber(expected)}</span>
+		<span class="gp-value gp-accent-amber text-lg!">{formatNumber(b.total)}</span>
 	</div>
 
 	<!-- Click contribution estimate -->