accept RAC props for toggle button components and add disabled style

[jivey]

https://openstax.atlassian.net/browse/CORE-1027
I need to set RAC props on this component in assignments, like isDisabled on both the group and the button.

[Copilot]

Pull Request Overview

This PR extends the toggle button components to accept React Aria props, adds a visual disabled style, updates snapshots to reflect new styling, and introduces a story for disabled state.

• Extend ToggleButtonGroupProps and item definitions to inherit from react-aria-components props
• Add [data-disabled] styling in CSS and bump version
• Update storybook with a Disabled example and refresh snapshots

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/components/snapshots/ToggleButtonGroup.spec.tsx.snap	Updated className hashes due to style tweaks
src/components/ToggleButtonGroup/styles.ts	Added disabled state color style
src/components/ToggleButtonGroup/index.tsx	Extended props to include RAC props, refactored item mapping
src/components/ToggleButtonGroup.stories.tsx	Added Disabled story to demo isDisabled usage
package.json	Bumped version to 1.18.1

Comments suppressed due to low confidence (3)

src/components/ToggleButtonGroup/index.tsx:27

• Ensure the underlying <button> receives a disabled prop (or aria-disabled) when itemProps.isDisabled is true so that browsers and assistive technologies enforce the disabled behavior.

          {...itemProps}

src/components/ToggleButtonGroup.stories.tsx:42

• We should add a unit or snapshot test for the Disabled state to verify that the disabled styling and interaction behavior are applied correctly.

export const Disabled = () => {

src/components/ToggleButtonGroup.stories.tsx:43

• Initializing selectedItem to an empty string yields a Set with "" as a key, which doesn’t match any button id. Consider starting with a valid id or undefined to avoid an empty-selection key.

  const [selectedItem, setSelectedItem] = React.useState('');