resetInputState
Cancels captured pointer input and clears hover and focus when the native window loses input ownership.
The owner-thread adapter invokes this for window blur or an explicit input reset while the host remains attached. The retained tree and immutable frame remain available, and repeated resets have no further transition to deliver.
Throws
when called from another thread, reentrantly, or while the host is not attached.
when input cleanup fails; the exact primary failure is preserved while remaining host cleanup is attempted.