[bug]: base-vega submenu triggers use data-open instead of data-popup-open

[meetdhruva]

Affected components

• context-menu — ContextMenuSubTrigger
• menubar — MenubarSubTrigger (via DropdownMenuSubTrigger)

Problem

The current base-vega registry emits data-open:bg-accent data-open:text-accent-foreground on submenu triggers:

• https://ui.shadcn.com/r/styles/base-vega/context-menu.json
• https://ui.shadcn.com/r/styles/base-vega/menubar.json

Base UI exposes data-popup-open on Menu.SubmenuTrigger when its submenu is open, not data-open. The equivalent context-menu trigger has the same attribute contract.

https://base-ui.com/react/components/menu

As a result, the generated open-submenu trigger styling does not activate.

Expected change

Replace the trigger selectors with:

data-popup-open:bg-accent data-popup-open:text-accent-foreground

data-open should remain on popup/content elements, where it is correct.

Reproduction

1. Initialize or configure a project with style: "base-vega".
2. Add context-menu or menubar.
3. Open a submenu and observe that its trigger does not receive the generated open styling.

I verified this against the current registry payload and @base-ui/react data-attribute declarations.