The Bots pane docks into the sessions zone but did not declare
collapsible. Below the sidebar-collapse breakpoint, the sessions pane
left the grid and the zone kept a stranded BOTS tab on screen.
The Bots pane now declares collapsible, so it leaves the grid with
its zone. The narrow edge overlay now mirrors the zone's tab strip
when the revealed pane has collapsed zone-mates. Without the strip,
only the first pane of the zone was reachable while collapsed. A
lone pane keeps the stripless overlay form.
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