NavbarCollapse closes when toggling a MegaMenuDropdown on mobile

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• I have tested the latest version

Describe the bug

On mobile, opening a mega menu dropdown immediately closes the navbar menu around it.

NavbarLink closes the collapse on any click:

https://github.com/themesberg/flowbite-react/blob/main/packages/ui/src/components/Navbar/NavbarLink.tsx#L46-L49

function handleClick(event: MouseEvent<HTMLAnchorElement>) {
  setIsOpen(false);
  onClick?.(event);
}

That handler is attached to the rendered element, including when as="span" is used purely as a wrapper. A <MegaMenuDropdownToggle> nested inside it bubbles its click straight into handleClick, so the dropdown opens and the surrounding <NavbarCollapse> collapses in the same click.

This affects the documented markup: megaMenu.fullWidth and the other mega menu examples all nest the toggle in <NavbarLink as="span">.

Steps to reproduce

<MegaMenu>
  <NavbarToggle />
  <NavbarCollapse>
    <NavbarLink as="span">
      <MegaMenuDropdownToggle>Company</MegaMenuDropdownToggle>
    </NavbarLink>
  </NavbarCollapse>
  <MegaMenuDropdown className="hidden w-full">
    <p>Company content</p>
  </MegaMenuDropdown>
</MegaMenu>

1. Narrow the viewport so <NavbarToggle> is visible
2. Click the navbar toggle to open the menu
3. Click "Company"

Current behavior

The dropdown opens, but <NavbarCollapse> gains hidden in the same click, so the menu closes underneath it.

Expected behavior

The navbar menu stays open while a mega menu dropdown is toggled.

Possible directions

Two options, and the choice is a maintainer call since it changes Navbar semantics:

1. Have NavbarLink skip setIsOpen(false) when the click originated from a nested interactive element (for example, when event.target is not the link itself). Fixes it centrally and keeps the "tapping a link closes the menu" behaviour intact.
2. Call event.stopPropagation() in MegaMenuDropdownToggle. Narrower, but it would also swallow any onClick a consumer attached to an ancestor, so it seems like the worse trade.

Context

Found while reviewing #1685, which fixes multiple dropdowns in a single mega menu. Verified this reproduces on main at 85319bd independently of that PR, so it is filed separately. Happy to open a PR once there is a preferred direction.

Start with packages/ui/src/components/Navbar/NavbarLink.tsx and reproduce the documented mobile interaction using apps/web/examples/megaMenu/megaMenu.fullWidth.tsx. Compare the two proposed event-handling directions with the existing Navbar semantics and verify the dropdown toggle no longer collapses the surrounding NavbarCollapse while ordinary links still close it.