Add purple color variant to chip component

[codegen-sh]

This PR adds a new purple color variant to the chip component.

Changes:

• Added new CSS variables for purple color:
  • --ui-color-purple-50: #f5f3ff;
  • --ui-color-purple-700: #6d28d9;
  • --ui-color-purple-600-10: #7c3aed1a;
• Added a new purple variant to the chip component with the class --purple
• Updated examples in the documentation to include the new purple chip variant

The purple chip variant follows the same pattern as the existing color variants (green, yellow, red, blue) and provides a new color option for users.