design-system: palette is dark-only with no light mode or color-scheme, and contrast is unverified

[joelpeace48-cell]

Problem

app/globals.css defines a dark-only palette, hardcoded on :root:

:root {
  --bg: #070b14;
  --surface: #0f1727;
  --text: #eaf2ff;
  --muted: #9bb1d3;
  --accent: #59c2ff;
}

There is no prefers-color-scheme handling anywhere in the file, and no
color-scheme declaration. Two consequences:

1. Visitors who prefer light get dark regardless — including in contexts where
   dark is genuinely worse, such as printing a compliance page or presenting on
   a projector in a bright room.
2. Because color-scheme is not set, browser-rendered UI (form controls,
   scrollbars, autofill) renders in light chrome against the dark page.

The token names are also literal rather than semantic (--bg, --accent-2),
which makes a second theme awkward to introduce cleanly.

What to do

• Rename to semantic tokens: --surface, --surface-raised, --text-primary,
  --text-muted, --border, --accent.
• Keep dark as the default — it suits the product — but define the full light
  palette under @media (prefers-color-scheme: light), redefining only token
  values, never component rules.
• Add color-scheme: dark light so browser UI matches.
• Optional explicit toggle persisting the choice, with no flash of the wrong
  theme on first paint.
• Verify every text/background pair against WCAG AA (4.5:1 body, 3:1 large) in
  both themes. --muted: #9bb1d3 on --surface: #0f1727 is the pair most
  likely to fail and it is used for body copy across most pages.

Acceptance criteria

• Semantic token layer replaces the literal names
• Light palette under prefers-color-scheme: light, tokens only
• color-scheme declared so browser UI matches the page
• No flash of incorrect theme on load
• Every pair passes AA in both themes, with measured results recorded

Notes

Fix contrast at the token layer rather than per component, otherwise the next
component reintroduces the failure. Related: the typography issue covering the
Inter font that is declared but never loaded.