The Session row's action strip stops click propagation itself, so a
`sidebar.workspaces.session.row.action` entry that renders a plain button no
longer opens the row as a side effect; the shipped buttons drop their own
handling. `Menu` decides submenu exclusivity on the list's own bubbles, by
DOM: reaching a top-level row that is not a submenu parent, by pointer or by
focus, closes the open card for data rows and component rows alike, which
the per-row handlers only did for data rows. A group start on the list's
first row draws no hairline.
The first live-fixture e2e case registers the scaffold's cleanup right after
launch, as the file's other cases do. The three pin scenarios the browser
spec lost when the order write moved into `UiWorkspace.pinSession` — newer
saved orders during a pending pin, a Workspace disappearing during one, and
members whose summaries are temporarily missing — return as service cases.
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