chore: install and configure Park UI panda preset with Radix Color System

[SteveJRobertson]

Integrate @park-ui/panda-preset to move away from bespoke color tokens toward the Radix Color System (Indigo/Slate).

Prerequisites

• Run Style Dictionary build to generate missing token files:

  pnpm nx run tokens:build-tokens

Tasks

• Install @park-ui/panda-preset (v0.43.1).
• Update panda.config.ts:
  • Add createPreset import.
  • Add presets array with indigo accent and slate gray.
  • Remove bespoke colors from theme.extend.tokens.
• Run pnpm panda codegen to regenerate the styled-system.

Validation

• pnpm nx typecheck react-button should pass without token resolution errors.