Checkbox Input

Create the next UI components to keep a consistent style:
- Checkbox Input

The Checkbox Input components should have:
- Default State
- Hover State
- Focus State
- Disabled State
- Error State

Start by locating the existing UI components that establish the project's consistent style, since the issue names no file or test entry point. Define the Checkbox Input against those components and verify that default, hover, focus, disabled, and error states are all represented and visually consistent.

Written by the indexing model from the issue text.