Dropdown popover stays visible when element is removed from DOM while open

[Manthan08]

When an is removed from the DOM while its popover is open (common in SPA frameworks that mount/unmount components),
disconnectedCallback calls cleanup() which removes scroll/resize listeners but does not hide the popover or reset aria-expanded on
the trigger.

This leaves a stale popover visible on screen with no way to dismiss it.

Steps to reproduce:

1. Open a dropdown
2. Remove the element from the DOM (e.g. el.remove())
3. The popover menu remains visible

Expected: Popover is hidden and ARIA state is reset on removal.

dropdown.js:70-73

[knadh]

Hi @Manthan08, when <ot-dropdown> is removed from the DOM, aren't all its children automatically removed along with it? A bit confused about what's happening here.