- lib/badges.ts + ProfileBadges: a profile shows (1) the built-in SkateSpots
badge, derived from a nip05 ending @skate-spots.org (app logo linking to
https://skate-spots.org/ — no storage, works for existing users), and (2) user
badges from a kind-0 badges array ({label,url?}) rendered as clickable chips.
- NIP19Page: app badge in the header, user badges in a 'Badges' card (replaces
the plain Sponsors section).
- EditProfileForm: Sponsors editor becomes a Badges editor (label + optional
link); saves the badges array and retires the legacy newline sponsors field.
Existing sponsors are read back as label-only badges, so nothing disappears.
