[context menu][menubar] Ensure submenus close when parents close

[atomiks]

Fixes these scenarios (and possibly more given it's general):

• Context Menu: Right click (without a pointerup release), move to a submenu, release on an empty area; root closes but submenu doesn't, so it lingers around until the root unmounts without fading out correctly (only visible when there are exit transitions, but also doesn't work with keepMounted prop). In JUI it happens while releasing over an item as well
• Menubar: ArrowRight inside a submenu to land on a new menuitem trigger in the menubar; same issue as above

[pkg-pr-new]

Open in StackBlitz

pnpm add https://pkg.pr.new/mui/base-ui/@base-ui-components/react@2768

pnpm add https://pkg.pr.new/mui/base-ui/@base-ui-components/utils@2768

commit: 674f8c4

[mui-bot]

Bundle size report

Bundle	Parsed size	Gzip size
@base-ui-components/react	🔺+242B(+0.07%)	🔺+48B(+0.04%)

Details of bundle changes

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[mnajdova]

I can't reproduce this on master. Can you share a reproduction and maybe a recording of what's happening?

[atomiks]

@mnajdova Menubar needs exit transitions on the menus: https://github.com/mui/joy-ui/pull/319#issuecomment-3282554478

Context Menu one is reproducible on JUI Context Menu docs