feat(pokedex): add shareable read-only dex links

src/routes/shared/[token]/+page.server.ts

@@ -0,0 +1,19 @@
+import { error } from '@sveltejs/kit';
+import { loadSharedPokedex } from '$lib/services/SharedPokedexService';
+import type { PageServerLoad } from './$types';
+
+export const load: PageServerLoad = async ({ locals, params, url, setHeaders }) => {
+	const shared = await loadSharedPokedex(locals.supabase, params.token);
+	if (!shared) throw error(404, 'Shared Pokédex not found');
+	setHeaders({
+		'Referrer-Policy': 'no-referrer',
+		'X-Robots-Tag': 'noindex, nofollow'
+	});
+
+	const canonicalUrl = `${url.origin}/shared/${params.token}`;
+	return {
+		shared,
+		canonicalUrl,
+		previewUrl: `${canonicalUrl}/preview.png`
+	};
+};