panel: a click that moves a point or two is still a click

any pointer movement between press and release started a panel drag and
swallowed the click, so clicking a row often did nothing and had to be
repeated: in a logged session, 12 of 17 clicks were taken as drags. the
5 that counted waited at most 4 ms and ran `dingger focus` in 60-120 ms.
a drag now needs more than 4 points of movement (isDrag, selftest).

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