add world opinions project

World map with switchable layers (what "liberal" means, what left vs right
is about, traditional/secular and survival/self-expression values), country
cards, a shared-scale party compass, a values scatter and national
narratives of major events.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/seo.ts

@@ -48,6 +48,11 @@ const publicPages: Record<string, { title: string; description: string }> = {
 	'/projects/spotify-beatmap-finder': {
 		title: 'osu! map finder',
 		description: 'Find osu! beatmaps for Spotify songs, albums and playlists.'
+	},
+	'/projects/world-opinions': {
+		title: 'World Opinions',
+		description:
+			'How political words, parties, values and national histories differ across the world.'
 	}
 };