feat: add protected badge for NIP-70 events

Display a subtle green "Protected" badge next to the username for
events with the `-` tag (NIP-70), indicating restricted distribution.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/Note/index.tsx

@@ -11,6 +11,7 @@ import AudioPlayer from '../AudioPlayer'
 import ClientTag from '../ClientTag'
 import Content from '../Content'
 import FollowingBadge from '../FollowingBadge'
+import ProtectedBadge from '../ProtectedBadge'
 import { FormattedTimestamp } from '../FormattedTimestamp'
 import Nip05 from '../Nip05'
 import NoteOptions from '../NoteOptions'
@@ -134,6 +135,7 @@ export default function Note({
               />
               <FollowingBadge pubkey={event.pubkey} />
               <TrustScoreBadge pubkey={event.pubkey} />
+              <ProtectedBadge event={event} />
               <ClientTag event={event} />
             </div>
             <div className="flex items-center gap-1 text-sm text-muted-foreground">