fix(web): text on a tint of its own hue uses the house -fg tokens (#3150)

A hue painted as text on a color-mix tint of itself sits close to the
surface under it. On Minstrel's surfaces the raw accent on its 15% tint
measures 1.97:1 at worst (dark mode, hover surface), against AA's 4.5.

- tokens.json gains colors.fg: the five FabledSword -fg formulas (accent
  45%, success 45%, warning, error and info 50%), each mixed toward
  parchment so one declaration serves both modes. Success is Minstrel's
  moss. tokens-to-css emits them in :root.
- Tailwind exposes them as text-accent-fg, text-warning-fg, text-error-fg
  and text-info-fg.
- 23 sites swapped: 14 Tailwind class strings (PlayerBar and the admin
  count pills) and 9 CSS rules (StatusPill's four tones and five accent
  chips). Worst case after: accent-fg 5.03, error-fg 4.75, warning-fg
  4.92, success-fg 4.85.
- scripts/check-tint-contrast.js finds the pair in either spelling. Its
  test scans src in the web Vitest lane and fails on any new site, with
  fixture cases showing it can fail.

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

web/src/lib/components/PlayerBar.svelte

@@ -184,7 +184,7 @@
               aria-pressed={player.shuffle}
               onclick={toggleShuffle}
               class="flex h-8 w-8 items-center justify-center rounded-full transition-colors {player.shuffle
-                ? 'bg-accent-tint text-accent'
+                ? 'bg-accent-tint text-accent-fg'
                 : 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'}"
             >
               <Shuffle size={16} strokeWidth={1.5} />
@@ -194,7 +194,7 @@
               aria-label={repeatLabel}
               onclick={cycleRepeat}
               class="flex h-8 w-8 items-center justify-center rounded-full transition-colors {player.repeat !== 'off'
-                ? 'bg-accent-tint text-accent'
+                ? 'bg-accent-tint text-accent-fg'
                 : 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'}"
             >
               {#if player.repeat === 'one'}
@@ -209,7 +209,7 @@
               aria-label={player.queueDrawerOpen ? 'Close queue' : 'Open queue'}
               aria-pressed={player.queueDrawerOpen}
               class="flex h-8 w-8 items-center justify-center rounded-full transition-colors {player.queueDrawerOpen
-                ? 'bg-accent-tint text-accent'
+                ? 'bg-accent-tint text-accent-fg'
                 : 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'}"
             >
               <ListMusic size={16} strokeWidth={1.5} />
@@ -392,7 +392,7 @@
         aria-pressed={player.shuffle}
         onclick={toggleShuffle}
         class="flex h-9 w-9 items-center justify-center rounded-full transition-colors {player.shuffle
-          ? 'bg-accent-tint text-accent'
+          ? 'bg-accent-tint text-accent-fg'
           : 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'}"
       >
         <Shuffle size={18} strokeWidth={1.5} />
@@ -402,7 +402,7 @@
         aria-label={repeatLabel}
         onclick={cycleRepeat}
         class="flex h-9 w-9 items-center justify-center rounded-full transition-colors {player.repeat !== 'off'
-          ? 'bg-accent-tint text-accent'
+          ? 'bg-accent-tint text-accent-fg'
           : 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'}"
       >
         {#if player.repeat === 'one'}
@@ -417,7 +417,7 @@
         aria-label={player.queueDrawerOpen ? 'Close queue' : 'Open queue'}
         aria-pressed={player.queueDrawerOpen}
         class="flex h-9 w-9 items-center justify-center rounded-full transition-colors {player.queueDrawerOpen
-          ? 'bg-accent-tint text-accent'
+          ? 'bg-accent-tint text-accent-fg'
           : 'text-text-secondary hover:bg-surface-hover hover:text-text-primary'}"
       >
         <ListMusic size={18} strokeWidth={1.5} />