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fix(Tooltip): dismiss on Escape key (WCAG 1.4.13) (#1126)

Hover/focus-triggered tooltips (and popovers, which extend Tooltip) could not
be dismissed by keyboard. Backport Bootstrap 6's pattern: on show, add a
document keydown listener in the capture phase (_setEscapeListener); on Escape
(while shown) preventDefault + stopPropagation and hide(); removed on
hide/dispose. Capture phase dismisses the tooltip before an ancestor dialog's
own Esc handler. Ported Bootstrap 6's three tests + documented the behavior in
the tooltip/popover docs.

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