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/scripts/tokens-to-css.js

@@ -19,6 +19,14 @@ export function emit(tokens) {
   for (const [name, value] of Object.entries(tokens.colors.flat)) {
     lines.push(`  --fs-${name}: ${value};`);
   }
+  // The house -fg tokens (FabledSword, 2026-08-27; #3150): a hue as TEXT on a
+  // tint of itself, mixed toward parchment. Parchment inverts in light mode,
+  // so one declaration lightens the text on dark surfaces and darkens it on
+  // light ones. Declared on :root, the element data-theme is set on, so the
+  // var()s resolve against that mode's parchment.
+  for (const [name, value] of Object.entries(tokens.colors.fg ?? {})) {
+    lines.push(`  --fs-${name}: ${value};`);
+  }
   for (const [name, value] of Object.entries(tokens.radii)) {
     lines.push(`  --fs-radius-${name}: ${value};`);
   }