The Session popover gains a way back to the home session: "Back to
<session>" when the overlay or its daemon started with a session file, or
"Default session" without one. It is disabled while home is already
active, and the side.session.home toolbar item hides it. The label and
destination come from the launch's home input, not from the session the
overlay is in.
Returning home is an explicit session command. Like Open, it saves dirty
current data first, refuses if the canvas or interaction changes while it
is pending, and replaces nothing unless home loads. Home loads the way a
launch would, from its own options for the current output, so recovery,
clear-boundary and tool-restore rules apply, and its load errors stay
those of a startup session file rather than becoming an empty session. A
home with persistence disabled continues unsaved on an empty canvas.
Once home is committed the overlay reports it, so the daemon forgets the
session it remembered. The overlay keeps whether it is home with its
reported target, so the menu needs no file system check on redraw.
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