fix(ui): add coherent light theme

[johnnyhuy]

Summary

• Add a warm Rigging Yard light token ladder for surfaces, text, borders, statuses, and native controls.
• Let macOS liquid glass follow the system appearance instead of applying a permanent dark tint.
• Replace dark-only status colors with shared theme tokens and update the design reference.

Testing

• pnpm run build
• pnpm run typecheck
• pnpm run lint
• pnpm run test
• Visually verified Watchtower in macOS light mode and checked the dark token path through CDP emulation.