The popup select panel and the model seat hold focus while open, and their Tab
fell through to the browser's traversal, leaving an open surface that only a
pointer press clears. Both now settle on Enter or Tab, leave on Escape or
Shift+Tab, walk with the arrows, and park on the value in use: the panel's
highlight on the row its options mark current, the seat's drilled pane on its
checked row, with the keyboard handed back to the cell that drilled in when the
pane is left.
Dismissal rides the conversation's own focus(), so the caret returns where the
draft left it instead of at the start.
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