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/lib/components/AlphabeticalGrid.svelte

@@ -201,7 +201,7 @@
     cursor: default;
   }
   .rail-btn.pending {
-    color: var(--fs-accent);
+    color: var(--fs-accent-fg);
     cursor: wait;
   }
   :global(.rail-btn .spin) {

web/src/lib/components/LikeButton.svelte

@@ -44,5 +44,5 @@
   aria-label={liked ? 'Unlike' : 'Like'}
   aria-pressed={liked}
   onclick={onClick}
-  class="rounded p-1 {sizeClass} {liked ? 'text-accent' : 'text-text-secondary hover:text-text-primary'}"
+  class="rounded p-1 {sizeClass} {liked ? 'text-accent-fg' : 'text-text-secondary hover:text-text-primary'}"
 >{liked ? '♥' : '♡'}</button>

web/src/lib/components/MobileAppDownload.svelte

@@ -48,9 +48,9 @@
     <a
       href={info.apkUrl}
       download="minstrel.apk"
-      class="mobile-app-download flex items-center gap-3 rounded-md border border-border bg-surface px-3 py-2 text-sm text-text-primary no-underline transition-colors hover:bg-surface-hover hover:text-accent focus-visible:ring-2 focus-visible:ring-accent"
+      class="mobile-app-download flex items-center gap-3 rounded-md border border-border bg-surface px-3 py-2 text-sm text-text-primary no-underline transition-colors hover:bg-surface-hover hover:text-accent-fg focus-visible:ring-2 focus-visible:ring-accent"
     >
-      <Smartphone size={18} strokeWidth={1.5} class="shrink-0 text-accent" />
+      <Smartphone size={18} strokeWidth={1.5} class="shrink-0 text-accent-fg" />
       <span class="flex flex-col leading-tight">
         <span class="font-medium">Get the Android app</span>
         <span class="text-xs text-text-secondary">

web/src/lib/components/QueueTrackRow.svelte

@@ -101,7 +101,7 @@
   >
     <div class="flex items-center gap-2 min-w-0">
       {#if isCurrent}
-        <span class="text-xs text-accent uppercase tracking-wide flex-shrink-0">Now playing</span>
+        <span class="text-xs text-accent-fg uppercase tracking-wide flex-shrink-0">Now playing</span>
       {/if}
       <span class="font-medium truncate text-text-primary">{track.title}</span>
     </div>