phsl / new-api

✨ feat: enhance SelectableButtonGroup with checkbox support and refactor pricing display settings (#1365)

- Add withCheckbox prop to SelectableButtonGroup component for checkbox-prefixed buttons
- Support both single value and array activeValue for multi-selection scenarios
- Refactor PricingDisplaySettings to use consistent SelectableButtonGroup styling
- Replace Switch components with checkbox-enabled SelectableButtonGroup
- Replace Select dropdown with SelectableButtonGroup for currency selection
- Maintain unified UI/UX across all pricing filter components
- Add proper JSDoc documentation for new withCheckbox functionality

This improves visual consistency and provides a more cohesive user experience
in the model pricing filter interface.