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/library/albums/+page.svelte

@@ -65,7 +65,7 @@
     <p class="text-text-secondary">
       No albums in your loaded library match
       <span class="font-medium">'{filter.trim()}'</span>.
-      <a href={`/search/albums?q=${encodeURIComponent(filter.trim())}`} class="text-accent hover:underline">
+      <a href={`/search/albums?q=${encodeURIComponent(filter.trim())}`} class="text-accent-fg hover:underline">
         Search the full library →
       </a>
     </p>

web/src/routes/library/artists/+page.svelte

@@ -63,7 +63,7 @@
     <p class="text-text-secondary">
       No artists in your loaded library match
       <span class="font-medium">'{filter.trim()}'</span>.
-      <a href={`/search/artists?q=${encodeURIComponent(filter.trim())}`} class="text-accent hover:underline">
+      <a href={`/search/artists?q=${encodeURIComponent(filter.trim())}`} class="text-accent-fg hover:underline">
         Search the full library →
       </a>
     </p>

web/src/routes/library/genres/+page.svelte

@@ -112,7 +112,7 @@
     <header class="space-y-2">
       <a
         href="/library/genres"
-        class="inline-flex items-center gap-1 text-sm text-accent hover:underline"
+        class="inline-flex items-center gap-1 text-sm text-accent-fg hover:underline"
       >
         <ChevronLeft size={14} aria-hidden="true" />
         All genres

web/src/routes/library/liked/+page.svelte

@@ -89,7 +89,7 @@
         title="No liked artists yet."
       >
         {#snippet actions()}
-          <a href="/library/artists" class="text-accent hover:underline">Browse artists →</a>
+          <a href="/library/artists" class="text-accent-fg hover:underline">Browse artists →</a>
         {/snippet}
       </EmptyState>
     {:else}
@@ -121,7 +121,7 @@
         title="No liked albums yet."
       >
         {#snippet actions()}
-          <a href="/library/albums" class="text-accent hover:underline">Browse albums →</a>
+          <a href="/library/albums" class="text-accent-fg hover:underline">Browse albums →</a>
         {/snippet}
       </EmptyState>
     {:else}
@@ -153,7 +153,7 @@
         title="No liked tracks yet."
       >
         {#snippet actions()}
-          <a href="/" class="text-accent hover:underline">Find something new →</a>
+          <a href="/" class="text-accent-fg hover:underline">Find something new →</a>
         {/snippet}
       </EmptyState>
     {:else}

web/src/routes/library/years/+page.svelte

@@ -97,7 +97,7 @@
     <header class="space-y-2">
       <a
         href="/library/years"
-        class="inline-flex items-center gap-1 text-sm text-accent hover:underline"
+        class="inline-flex items-center gap-1 text-sm text-accent-fg hover:underline"
       >
         <ChevronLeft size={14} aria-hidden="true" />
         All years