Fixes#29426
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## Summary by CodeRabbit
- **New Features**
- Introduced `isLoading` state for action items to provide user feedback
during actions.
- Added `onAction` callback to menu items for improved interaction
handling.
- **Enhancements**
- Enhanced action group visibility based on orientation.
- Streamlined modal control flow with keys for different modal sizes.
- Implemented `htmlFor` attribute in checkboxes for better form
accessibility.
- **Refactor**
- Transitioned from `ButtonGroup` to `ActionGroup` across various
components for consistency.
- Refactored component structures to integrate new `ActionGroup` and
`Item` components.
- Updated widget configuration and properties to accommodate new
features and styles.
- **Style Updates**
- Added new CSS rules for buttons with `data-density="compact"`.
- Removed outdated CSS properties to align with updated design system.
- **Documentation**
- Updated story examples to reflect changes in modal and action group
usage.
- **Bug Fixes**
- Fixed association issues between labels and checkbox inputs.
- **Configuration**
- Introduced `anvilConfig` for widget size properties and updated
property pane configuration.
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