action_approval_reject_with_reason

Handle Tab in the approval menu - open the free-text reject field.

The approval footer advertises Tab unconditionally, so it needs the same App-level mirror as the other advertised keys above; without one, Tab falls through to Screen.focus_next (or chat-input completion) and does nothing whenever the menu is not the focused widget. Focus-gated like approval_up/down/select, since Tab belongs to the input's own completion handling while the user is typing a prompt.