The v0.20.0 migration from Playwright to the native Rust daemon introduced
two regressions in checkbox/radio handling:
1. `is_element_checked` only read `this.checked`, which is undefined on
non-input elements. Material Design and ARIA controls use wrapper divs
with `role="checkbox"` and `aria-checked`, or hide the native input
off-screen inside a label. The function now mirrors Playwright's
`getChecked()` with follow-label retargeting: native `.checked`,
`aria-checked` for ARIA roles, `label.control` traversal, and nested
input lookup.
2. `check`/`uncheck` accepted the coordinate-based CDP click result
without verifying the state actually changed. When the AX tree's
`backendDOMNodeId` points to a hidden off-screen input (common in
Material Design), `Input.dispatchMouseEvent` hits nothing. The actions
now re-check state after clicking and fall back to a JS `.click()` on
the resolved input — matching Playwright's `_setChecked` verify step.
Adds e2e regression test covering Material Design (hidden input + ripple
overlay), ARIA-only, and native checkbox patterns.
Co-authored-by: ctate <366502+ctate@users.noreply.github.com>
