spotters: most-active-in sort with country/region selector, collection tracking (seen marks, progress, filters), refresh scripts score activity and report new NL entries

src/routes/trackers/trains/seen/+server.ts

@@ -0,0 +1,14 @@
+import { error, json } from '@sveltejs/kit';
+import { isOwner } from '#lib/server/owner.js';
+import { parseSeenBody, setSeen } from '#lib/server/spotting.js';
+import type { RequestHandler } from './$types';
+
+/** Owner-only: mark / unmark an entry as seen (collected), optionally with a date and note. */
+export const POST: RequestHandler = async (event) => {
+	if (!isOwner(event)) error(404, 'Not Found');
+	const body = parseSeenBody(await event.request.json().catch(() => null));
+	if (!body) error(400, 'Bad request');
+	const ok = await setSeen('trains', body.id, body.seen, body.seenOn, body.note);
+	if (!ok) error(404, 'No such entry');
+	return json({ ok: true, ...body });
+};