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

The book_comments collection has a custom 'id' field (type: text,
required: true) distinct from PocketBase's system record ID.
Every comment POST was returning 400 validation_required because
the id field was never sent.

Fix: generate a 15-char hex ID via crypto.randomUUID() and include
it in the payload, matching PocketBase's own ID alphabet.

ui/src/lib/server/pocketbase.ts

@@ -1530,6 +1530,7 @@ export async function createComment(
 		method: 'POST',
 		headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' },
 		body: JSON.stringify({
+			id: crypto.randomUUID().replace(/-/g, '').slice(0, 15),
 			slug,
 			chapter,
 			body,

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;
 	}