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/now-playing/+page.svelte

@@ -163,7 +163,7 @@
           aria-label="Shuffle"
           aria-pressed={player.shuffle}
           class="flex items-center justify-center min-h-[44px] min-w-[44px] rounded
-                 {player.shuffle ? 'text-accent' : 'text-text-secondary hover:text-text-primary'}
+                 {player.shuffle ? 'text-accent-fg' : 'text-text-secondary hover:text-text-primary'}
                  focus-visible:ring-2 focus-visible:ring-accent"
         >
           <Shuffle size={20} strokeWidth={1.5} />
@@ -216,7 +216,7 @@
           aria-label={repeatLabel}
           aria-pressed={player.repeat !== 'off'}
           class="flex items-center justify-center min-h-[44px] min-w-[44px] rounded
-                 {player.repeat !== 'off' ? 'text-accent' : 'text-text-secondary hover:text-text-primary'}
+                 {player.repeat !== 'off' ? 'text-accent-fg' : 'text-text-secondary hover:text-text-primary'}
                  focus-visible:ring-2 focus-visible:ring-accent"
         >
           {#if player.repeat === 'one'}