feat(ui): design tokens + light/dark theming, migrate in-game chrome (F1a)

Introduce the shared design-token system under ui/frontend/src/lib/theme/: tokens.css (dark default + light palette, plus spacing/radii/typography scales), base.css global baseline (document background, text, token focus ring, selection), and theme.svelte.ts (system/light/dark choice, persisted to localStorage, applied via data-theme on <html>). A pre-paint guard in app.html resolves the theme before the app boots to avoid a flash, and the theme picker is wired into the previously-disabled account-menu stub. Migrate the always-visible in-game chrome to the tokens (header, account menu, sidebar, tab-bar, bottom-tabs, shell background): dark renders as before, light comes for free. The default stays dark during the incremental migration; the remaining view bodies migrate in F1b. Docs: ui/docs/design-system.md (+ index entry). Test: tests/theme.test.ts. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-22 07:02:13 +02:00
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@@ -9,6 +9,9 @@ lives in [`../PLAN.md`](../PLAN.md), the active web finalization in

 ## Foundation & platform

+- [design-system.md](design-system.md) — the design tokens (colour /
+  spacing / typography), the light/dark theming mechanism, and the
+  component migration conventions.
 - [navigation.md](navigation.md) — routes, the sidebar tabs, and the
  state-preservation rules across view/tab switches.
 - [storage.md](storage.md) — the `KeyStore` and `Cache` abstractions and