Board Setup -> "Import Settings from Another Board..." -> browse opens three
nested wx modals; a click inside the top file dialog leaked to the Import
Settings dialog beneath it (its checkbox toggled). New Playwright e2e repro
asserts the click no longer reaches the shadowed modal, with a sanity phase
proving it does toggle when Import Settings is the topmost modal. Lives in
tests/kicad/ so the kicad-firefox/kicad-chromium projects run it on both
engines automatically (no routing list; lint-ci-coverage satisfied).
Bumps wxwidgets to the JS-layer input barrier fix (build/wasm/wx.js) that
stops the click leaking through the shadowed dialog's live DOM controls.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
