panel: on/off is persistent; what it shows is a separate setting

hiding the panel with the shortcut used to last only until another agent
started waiting: one action meant both "not now" and "off", with an
invisible override on top of a three-way mode. now there are two visible
settings: the panel is on or off (ctrl+opt+cmd+e and a checkmarked "Show
Panel" item), and while on it shows always or only when agents are waiting
("Panel Shows"). off stays off. turning it on with nothing to show peeks
for 3 seconds. the old mode setting migrates.

selftest covers the rules; it fails if a waiting agent can show a panel
that is off.

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