feat: add control resources

[han4wluc]

Summary

• replace the old keyboard resource/action path with resources.controls and actions.control
• let a control resource own both keyboard bindings and control UI elements
• add focused engine coverage for control presentation/render behavior and migrate the VT keyboard example

Breaking Change

• removes resources.keyboards
• removes actions.keyboard
• keyboard bindings now live under resources.controls[*].keyboard
• control activation now uses actions.control.resourceId

Version

• bump package version to 0.3.0

Testing

• bun run test
• bun run build