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/app/globals.css

@@ -54,6 +54,8 @@ input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); ou
 .nav-links a { text-decoration: none; color: var(--muted); }
 .nav-links a:hover { color: var(--text); }
 .nav-links a.btn-primary { color: var(--accent-text); }
+.nav-links a.support-link { color: #ff7aa8; }
+@media (max-width: 480px) { .nav-links a.support-link { display: none; } }
 
 .btn {
   display: inline-flex; align-items: center; justify-content: center;
@@ -117,6 +119,7 @@ a.recent-row:hover .recent-title { color: var(--accent); }
 .recent-text { display: flex; flex-direction: column; min-width: 0; flex: 1; }
 .recent-text > span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .recent-title { font-weight: 600; }
+.credit { margin: 0.6rem 0 0; font-size: 0.8rem; }
 .recent-time { font-size: 0.8rem; white-space: nowrap; }
 .artwork-sm.artwork-empty { display: grid; place-items: center; background: var(--surface-2); color: var(--muted); }
 .picked { display: flex; gap: 0.75rem; align-items: center; }