radio: public read-only tracker for Opa (NL/EN toggle, bigger type and tap targets)

Visitors see frequencies, banks, nets, ISS passes and the log without logging in; every
write stays owner-only (actions check the owner, hooks refuse non-GET). The public payload
drops reminder switches, log notes and inactive nets, and the page no longer shows the
observer coordinates (only "Gouda"). Dutch/English toggle (?lang, cookie, Accept-Language,
NL fallback). Larger fonts, high-contrast labels and 44px+ controls for phones and tablets;
radio listed as public (no lock) and in the sitemap; banks CSV public.

src/lib/projects.ts

@@ -428,10 +428,10 @@ const allTrackers: readonly (Tracker & { private: boolean })[] = [
 	},
 	{
 		name: 'radio',
-		subtitle: 'scanner frequencies, banks, nets, ISS passes and my listening log',
+		subtitle: "Opa's scanner frequencies, banks, nets, ISS passes and my listening log",
 		href: '/trackers/radio',
 		external: false,
-		private: true
+		private: false
 	},
 	{
 		name: 'math',