A Session row's "..." menu and its hover buttons become two list slots the
WorkspaceBrowser entry declares, `sidebar.workspaces.session.menu.item` and
`sidebar.workspaces.session.row.action`. The shipped actions register from
apply the way a client plugin does: pin (menu 100, button 200), rename (200),
fork (300), archive (menu 400, button 100). An entry receives only the row
identity, reads the pin and archive sets through Set hooks its own face
injects, decides its own visibility, renders `MenuItemButton` or one icon
button, and dismisses the menu through the slot-level `useMenuOpenState`
hook bound from the row's render occurrence.
Each action's behavior lives in its injected callbacks. `UiWorkspace` gains
`pinSession` and `unpinSession`; the pin write into the saved orders happens
there, through the viewing-store instance the apply creates and hands the
browser's registration as its handle (the ui-layout pattern), reading the
memberships current at completion. The rename dialog and the row-action
notice are `shell.overlay` entries fed by apply-closure observables through
the faces' `hooks`; the archived notice switches the archived filter
directly. WorkspaceBrowser threads no action callbacks, renders no toast,
and hosts no rename dialog; its title double-click raises the same rename
request.
In ui-primitives, `MenuItemButton` is the plain `role="menuitem"` row for
menus whose rows are components: it shares a data row's markup and styling
and needs no shared state, because `Menu` decides the keyboard walk from the
DOM and now runs the post-selection focus return once on the list's click
bubble for every row kind. `Menu` accepts such rows as `children` beside
`items`, which becomes optional together with `onSelect`; `separatorBefore`
lets a row start a group with the same hairline a separator entry draws. The
context-based `MenuAction` goes away with its extension group.
imccyu
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