Unlock everything, add a donation link, credit Last.fm, nudge re-linking

- Every feature is free for everyone (the plan system stays for later);
  remaining limits are abuse guards
- Optional website donation link (NEXT_PUBLIC_DONATION_URL). Not shown in
  the mobile apps, where tips to the developer generally need in-app
  purchase
- Last.fm/ListenBrainz-sourced plays link to the user's profile, as
  Last.fm's API terms require
- Connections track when they last saw activity; a scrobbler silent for
  over a week prompts re-linking Spotify (its link expires every 6 months)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

apps/web/src/components/RecentPlays.tsx

@@ -1,8 +1,17 @@
 'use client';
 
-import { SERVICE_LABELS, openUrl, timeAgo, type RecentPlayDTO, type StreamingService } from '@musicshare/shared';
+import { SERVICE_LABELS, openUrl, timeAgo, type ProfileDTO, type RecentPlayDTO, type StreamingService } from '@musicshare/shared';
 
-export function RecentPlays({ plays, preferred }: { plays: RecentPlayDTO[]; preferred: StreamingService | null | undefined }) {
+export function RecentPlays({
+  plays,
+  preferred,
+  attribution = {},
+}: {
+  plays: RecentPlayDTO[];
+  preferred: StreamingService | null | undefined;
+  attribution?: ProfileDTO['attribution'];
+}) {
+  const credits = (['lastfm', 'listenbrainz'] as const).filter((s) => attribution[s] && plays.some((p) => p.source === s));
   if (plays.length === 0) return null;
   return (
     <section className="card">
@@ -39,6 +48,14 @@ export function RecentPlays({ plays, preferred }: { plays: RecentPlayDTO[]; pref
           );
         })}
       </ul>
+      {credits.map((s) => (
+        <p key={s} className="muted credit">
+          Some plays via{' '}
+          <a href={attribution[s]} target="_blank" rel="noreferrer">
+            {s === 'lastfm' ? 'Last.fm' : 'ListenBrainz'}
+          </a>
+        </p>
+      ))}
     </section>
   );
 }