Navigation: Fixes aria-expanded not updating on hover submenu inside overlay

[himanshupathak95]

What?

Closes #76658

When Submenu Visibility is set to Hover, the toggle button's aria-expanded attribute does not update to true when hovering over a submenu inside a Navigation Overlay. The submenu was visually shown, but aria-expanded remained false, creating a mismatch that screen readers would report as "closed" for a visible submenu.

Why?

The openMenuOnHover and closeMenuOnHover action handlers contained a guard that prevented them from running when the parent overlay was already open because overlayOpenedBy had a truthy value.

Since pointerenter directives are only added to <li> elements when submenuVisibility === 'hover', removing the guard is safe since those events can only fire inside an already-open overlay, which is exactly when the state should be updated.

How?

Removed the overlayOpenedBy guard from openMenuOnHover and closeMenuOnHover in
packages/block-library/src/navigation/view.js.

Testing Instructions

1. Go to Appearance → Editor → Templates.
2. Edit a template that has a navigation in an overlay (or set Overlay Menu to Always).
3. Add a Navigation block with a Submenu item and set Submenu Visibility to Hover.
4. Save and view the frontend.
5. Click Open menu to open the overlay.
6. Hover over the submenu parent item.
7. Inspect the toggle <button> — aria-expanded should now be "true" while hovered.
8. Hover away — aria-expanded should return to "false".
9. Confirm Click mode submenus, keyboard navigation, and Escape/focus-trap behaviour
   are unaffected.

Screenshots or screencast

Before

Screen.Recording.2026-04-22.at.21.30.43.mov

After

Screen.Recording.2026-04-22.at.21.27.40.mov

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