docs: add highlight prop to figma code connect files

[pixelflips]

Description

Updates Figma Connect files for pds-input, pds-select, and pds-textarea components to support the newly added highlight prop.

Changes

• Added highlight boolean prop mapping to pds-input.figma.ts (shared props and both TEXT/SEARCH variants)
• Added highlight boolean prop mapping to pds-select.figma.ts
• Added highlight boolean prop mapping to pds-textarea.figma.ts

This ensures the Figma Connect integration properly syncs the highlight state between Figma designs and code implementations.

Fixes https://kajabi.atlassian.net/browse/DSS-1565

Screenshot

Type of change

• This change requires a documentation update

How Has This Been Tested?

• tested manually
  • Verified all three Figma Connect files pass linting
  • Confirmed highlight prop definitions follow existing boolean prop patterns
  • Validated syntax matches other components (pds-switch, pds-checkbox)
  • Verified highlight prop displays properly in Figma library

Test Configuration:

• Pine versions:
• OS:
• Browsers:
• Screen readers:
• Misc:

Checklist:

If not applicable, leave options unchecked.

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Design has QA'ed and approved this PR

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