hive-dialog's dismiss-on-backdrop-click handler checked e.target === this
(the host). Shadow DOM event retargeting sets e.target to the host for
ANY click that originated inside the shadow tree once it reaches a
listener attached on the host itself, not just clicks that actually hit
the host's own rendering — so the check was true for every click inside
.box that no other element's listener consumed first (title, message, a
bare checkbox row with no button to intercept it), immediately closing
the whole dialog. Reported by mara: clicking a checkbox in a
confirmation dialog (e.g. the restart dialog) dismissed the dialog
instead of toggling the box.
Switched to e.composedPath()[0] === this, the true original target
unaffected by retargeting — true only for a genuine backdrop click.
e9a1764f42