feat: show +X/clic under the tadpole counter

Frontend/src/routes/jeu/+page.svelte

@@ -69,6 +69,12 @@
 			>
 				{formatNumber(game.state.resources)}
 			</div>
+			<span
+				class="text-sm font-semibold pointer-events-none"
+				style="color: rgba(255,255,255,0.5); font-family: var(--font); text-shadow: 0 1px 4px rgba(0,0,0,0.6);"
+			>
+				+{formatNumber(game.clickGain)} / clic
+			</span>
 		</div>
 
 		<!-- Desktop sidebar -->