IBX-7999: Checkbox and ThreeStateCheckbox

[GrabowskiM]

🎫 Issue	IBX-7999

Related PRs:

• IBX-7999: Checkbox and ThreeStateCheckbox design-system-twig#13

Description:

For QA:

Documentation:

[Copilot]

Pull Request Overview

This PR implements checkbox components by introducing a basic Checkbox component and a ThreeStateCheckbox component that extends it with indeterminate state support. The implementation includes proper styling, ref forwarding, and comprehensive Storybook documentation.

• Added Checkbox component with standard checkbox functionality and proper event handling
• Added ThreeStateCheckbox component that extends Checkbox to support indeterminate state
• Enhanced BaseInput component to support ref forwarding for the new checkbox implementations

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/components/src/internal/partials/BaseInput/BaseInput.types.ts	Added Ref type import and ref prop to support forwarding refs to input elements
packages/components/src/internal/partials/BaseInput/BaseInput.tsx	Added ref prop handling to forward refs to the underlying input element
packages/components/src/inputs/Checkbox/*.tsx	Implemented basic Checkbox component with proper event handling and styling
packages/components/src/inputs/ThreeStateCheckbox/*.tsx	Implemented ThreeStateCheckbox extending Checkbox with indeterminate state support
packages/assets/src/scss/inputs/_checkbox.scss	Added comprehensive CSS styling for checkbox states including indeterminate
packages/assets/src/scss/styles.scss	Imported checkbox styles into the main stylesheet

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}