[react] Add commandFor and command attributes to ButtonHTMLAttributes

Summary

The Invoker Commands API adds commandfor and command attributes to <button>. These are missing from ButtonHTMLAttributes in @types/react.

HTML spec

• whatwg/html PR: https://github.com/whatwg/html/pull/9841
• MDN: https://developer.mozilla.org/en-US/docs/Web/API/HTMLButtonElement/commandForElement

Browser support

• Chrome/Edge 135+
• Safari Technology Preview
• Firefox Nightly (behind flag)

Expected types

interface ButtonHTMLAttributes<T> extends HTMLAttributes<T> {
  commandFor?: string | undefined
  command?: string | undefined
}

command accepts built-in values (toggle-popover, show-popover, hide-popover, show-modal, close, request-close) and custom strings (prefixed with --).

Current workaround

Projects augment the module locally:

import 'react'

declare module 'react' {
  interface ButtonHTMLAttributes<T> extends HTMLAttributes<T> {
    commandFor?: string
    command?: string
  }
}

React already ships popoverTarget and popoverTargetAction on button — commandFor/command is the successor API from the same spec space.