On an Apple TV the wake prompt was a dead end: the host failed to wake,
and neither Cancel nor Try Again could be pressed with a controller.
`ConnectOverlay` and `TrustCardView` each mount a zero-size view that
owns a `GamepadMenuInput` for the overlay's lifetime, and both gated it
to iOS and macOS. That is not tvOS being driven some other way — the
console home underneath runs the same binding there, and it gates itself
inactive while an overlay is up, so with no binding in the overlay
nothing read the pad at all. The trust card had the same hole, between a
pad-only Apple TV and every unknown host.
`GamepadPrompt` keeps its exclusion: it replaces system alerts that the
tvOS focus engine already drives, which its own header says.
Both bindings need an EXTENDED gamepad, the same thing that turns the
console UI on, so this covers the takeover exactly. A Siri Remote is not
one and reaches these buttons through the focus engine or not at all;
whether focus lands in either overlay is unverified and not addressed.
Refs #453