* refactor(ui): design token audit — replace hardcoded colors with CSS custom properties

- Add chart, log-level, and syntax-highlighting token families to design-system.css
  (dark + light variants)
- Migrate agent-dashboard.css from hardcoded surface/border/text colors to design tokens
  (--surface-1, --border, --text, --muted, --ok, --danger, etc.)
- Migrate logs.css level-chip colors to --log-* tokens using color-mix() for alpha variants
- Migrate usage.ts inline styles from #ff4d4d / rgba(...) to --danger / --danger-muted tokens
- Migrate chat layout.css and text.css to use design-system border/surface/muted tokens
- Migrate layout.css to use --surface-1, --border, --text, --radius-lg tokens
- Update command-palette.ts and CTA modals to use design-system tokens
- Update app-render.ts and helpers to use semantic color tokens

13 files changed, ~316 insertions, ~204 deletions — zero functional changes

* UI: fix skip-nav focus outline color (openclaw#323)

* WIP: design token audit - CSS + component updates + landing demos

* Fix ReferenceError: import `nothing` from lit in renderTab (openclaw#359)

The `aria-current` attribute used `nothing` to remove itself on inactive
tabs, but `nothing` was never imported from lit. This caused a
ReferenceError on every inactive tab render, breaking navigation.

https://claude.ai/code/session_01GVGyw7dEgvPFFqwnfSNZr2

Co-authored-by: Claude <noreply@anthropic.com>

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Co-authored-by: Claude <noreply@anthropic.com>