S2's headline was never a new Menu: `ActionMenu` already sits on `AnchoredPopover`
(arrows, typeahead, Escape, anchor-flip). What was missing is an INPUT PATH into it, so
this adds `useContextMenu` + `<ContextMenu>` over the same `ActionMenuItem[]` and the same
`MenuItemList` — a row cannot grow a right-click menu that looks or behaves unlike its own
⋯ menu. Three ways in: right-click anywhere on the row, long-press on touch/pen, and
Shift+F10 / the Menu key. The LEFT button is untouched and keeps the row's own action.
One popover per list, anchored to a virtual element at the pointer (native behaviour, and
a table of 200 rows would otherwise mount 200 floating contexts to keep 199 shut).
Platform bits it needed: `hoverAlso` on AnchoredPopover (a submenu falls open under a
mouse and is tapped by a finger — mouse-only, so a tap's synthetic mouseenter can't race
the click toggle) and `elementRef` on PopoverItem (the submenu anchors to the very
menuitem that opens it, where aria-haspopup/expanded belong). `ActionMenuItem` becomes a
discriminated union — a row either fires or opens a submenu — plus `danger` and
`separatorBefore`.
First consumers, both in Playlists:
- item rows: play · move to another list (a submenu of every other playlist, one gesture)
· to top / up / down / bottom · remove. Reordering goes through the same undoable store
as the drag handle and is disabled under a view for the same reason, with the same
explanation rather than silence.
- rail rows: rename (in the row that was right-clicked, keeping its cover so the rail
doesn't jump) · delete. Both now run through `usePlaylistActions`, which also takes over
the detail header's pencil and trash — the delete dialog's YouTube branch and the
"what gets selected next" rule exist once, not twice.
- the rail gains a "recently changed" sort key off the new `updated_at`. NOT the default:
a rail that reshuffles itself while you look at it costs more than it saves.
