- Popup items now render inside one bordered container with
borderless buttons so the menu reads as a single widget instead
of stacked tiles.
- Arrow Up / Down (and Tab) walk `grip_popup.selected` while the
popup is open; Enter commits the highlighted item by re-emitting
`GripMenuPick`; Escape dismisses without acting; the underlying
handlers (`CommandHistoryPrev/Next`, `CommandFinalize`,
`CommandEscape`, `DynTabNext`) keep their normal behaviour when
no popup is open.
- A press inside the viewport that reaches the mouse_area (i.e. not
on a popup item) closes the popup and consumes the click — the
user's next press then starts a normal selection / drag.
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