fix: restore swipeStartX declaration (newline eaten in prior edit)

ui/src/routes/+page.svelte

@@ -105,7 +105,8 @@
 		autoAdvanceSeed++;
 	}
 
-	// ── Swipe handling ───────────────────────────────────────────────────────	let swipeStartX = 0;
+	// ── Swipe handling ───────────────────────────────────────────────────────
+	let swipeStartX = 0;
 	function onSwipeStart(e: TouchEvent) {
 		swipeStartX = e.touches[0].clientX;
 	}