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/settings/page.tsx

@@ -5,13 +5,16 @@ import { Suspense, useState } from 'react';
 import useSWR from 'swr';
 import {
   SERVICE_LABELS,
+  SPOTIFY_LINK_PAGES,
   STREAMING_SERVICES,
+  isQuietScrobbler,
   type ConnectionDTO,
   type MeDTO,
   type NowPlayingProvider,
   type TrackSearchResultDTO,
 } from '@musicshare/shared';
 import { SharingControls } from '@/components/SharingControls';
+import { SupportCard } from '@/components/SupportLink';
 import { api, fetcher, useMe } from '@/lib/api';
 import { timeAgo } from '@musicshare/shared';
 import { useDebounced } from '@/lib/useDebounced';
@@ -36,6 +39,7 @@ function Settings() {
       <SharingControls />
       <Connections />
       <FeaturedPicker />
+      <SupportCard />
       <DangerZone />
     </div>
   );
@@ -189,6 +193,16 @@ function Connections() {
           )}
         </div>
 
+        {connections.filter((c) => isQuietScrobbler(c)).map((c) => (
+          <div className="notice" key={`quiet-${c.provider}`}>
+            Nothing new from {SERVICE_LABELS[c.provider]} in over a week. If you listen on Spotify, its link to{' '}
+            {SERVICE_LABELS[c.provider]} expires every 6 months.{' '}
+            <a href={SPOTIFY_LINK_PAGES[c.provider as 'lastfm' | 'listenbrainz']} target="_blank" rel="noreferrer">
+              Re-link Spotify
+            </a>
+            .
+          </div>
+        ))}
         {spotifyLimited && (
           <div className="notice">
             <strong>Spotify sign-in is limited during beta.</strong> Spotify only lets a few accounts sign in to new apps