Apple TV single-line fields moved to the engine's UITextField proxy in
2.10.0 (71735354), which made three focus behaviours user-visible.
Submitting re-attached the input connection. EditableText schedules a
restart when a submit action fires with a non-null onSubmitted, and that
microtask runs before the setState flipping readOnly, so the field
re-showed a keyboard the form had just dismissed. The native path now
withholds onSubmitted from EditableText and invokes it from the host,
independently of onEditingComplete as _finalizeEditing does.
Auto-open fired on every focus entry, so D-pad traversal of a multi-field
form raised and dismissed the modal system keyboard on each step.
TvTextInputAutoOpenBehavior gains onFirstFocus, and the new `automatic`
default resolves to it on Apple TV: arriving at a field opens it once,
returning to it does not. Android TV keeps its docked-IME auto-open, and
explicit modes stay literal on both. The autofocused Jellyfin and Seerr
URL fields keep an explicit exception so entering the screen still does
not bury the form (#1217).
EditableText.connectionClosed unfocuses the field outright, so a UIKit
keyboard dismissal left nothing focused at all. The host takes focus back,
keyed on identity with the field's own enclosing scope so a dialog or
route claiming focus meanwhile is left alone.
close#1728
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