feat: add Silent Payment (BIP 352) support to kind 0 profiles (#758)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: BoltTouring <BoltTouring@users.noreply.github.com>
Co-authored-by: Tanjiro <claude@tricycle.cc>

src/lib/event-metadata.ts

@@ -74,6 +74,7 @@ export function getProfileFromEvent(event: Event) {
       lud06: profileObj.lud06,
       lud16: profileObj.lud16,
       lightningAddress: getLightningAddressFromProfile(profileObj),
+      sp: profileObj.sp,
       created_at: event.created_at,
       emojis: emojis.length > 0 ? emojis : undefined
     }