fix(web): all accent text and icons use accent-fg (#5318)

The raw accent fails AA as text on every dark surface, not only on its
own tint: 3.04:1 on the page, 2.70 on iron, 2.21 on slate, against 4.5.
accent-fg (the house formula, 45% toward parchment) measures 5.62 at
worst across both modes. The operator chose the readable colour over the
signature teal for text, on 2026-10-08.

- 36 sites swap. They are 35 Tailwind uses: links, "Now playing", the
  ingest progress line, active shuffle/repeat, the liked heart, the app
  download icon and its hover. The last is the alphabet rail's pending
  spinner in CSS. Icons follow the text: as graphics they need only
  3:1, and the raw accent misses even that on iron.
- check-tint-contrast adds accent to TEXT_NEVER_RAW, so a new raw
  text-accent or color: var(--fs-accent) fails the web lane. Run against
  the files before the swap, it finds all 36. Borders, rings and fills
  keep the raw accent.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/routes/settings/+page.svelte

@@ -363,7 +363,7 @@
               <button
                 type="button"
                 onclick={clearToken}
-                class="text-sm text-accent hover:underline"
+                class="text-sm text-accent-fg hover:underline"
                 disabled={$tokenMutation.isPending}
               >clear</button>
             </div>
@@ -402,7 +402,7 @@
         {/if}
 
         <p class="text-xs text-text-secondary">
-          Get a token at <a href="https://listenbrainz.org/profile/" target="_blank" rel="noopener" class="text-accent hover:underline">listenbrainz.org/profile</a>.
+          Get a token at <a href="https://listenbrainz.org/profile/" target="_blank" rel="noopener" class="text-accent-fg hover:underline">listenbrainz.org/profile</a>.
           Tokens are stored unencrypted in this server's database — treat as sensitive.
         </p>
       </div>
@@ -682,7 +682,7 @@
     <h2 class="text-lg font-semibold">Library</h2>
     <ul class="space-y-2 text-sm">
       <li>
-        <a href="/library/hidden" class="text-accent hover:underline">Hidden tracks</a>
+        <a href="/library/hidden" class="text-accent-fg hover:underline">Hidden tracks</a>
         <span class="text-text-secondary"> — tracks you've flagged as bad rips, wrong tags, or otherwise unplayable.</span>
       </li>
     </ul>