coreui / coreui-pro / 34004417765

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feat(ContextMenu): right-click menu built on the Menu engine (#1157)

* refactor(Menu): resolve key events through the open-instance registry

A keydown inside an open menu now finds its instance in the open-instance
registry instead of searching for a toggle next to the menu element. That
lookup failed once `container` moved the menu to the body (and could pick
an unrelated toggle when several menus share a parent), leaving arrow keys
and Escape dead in a moved menu; it also lets a subclass with its own
trigger reuse the same document-level handlers. Escape returns focus to the
instance's own element.

`clearMenus` now ignores the right button on click events only, so a
`contextmenu` event can be routed through it. The reference-element
resolution shared by `_createFloating` and `_updateFloatingPosition` moves
into one `_getReferenceElement` method.

* feat(ContextMenu): right-click menu built on the Menu engine

Adds the PRO `ContextMenu` component: a right-click, a long-press that
dispatches `contextmenu`, or Shift+F10 / the Menu key inside an element
with `data-coreui-toggle="context-menu"` opens the neighbouring `.menu` at
the pointer and suppresses the browser menu. The menu is a regular `.menu`,
so items, submenus, keyboard navigation and dismissal come from Menu.

- Positions with `strategy: 'fixed'` against a virtual reference at the
  pointer (`reference: 'pointer'`); keyboard invocation and `show()` without
  a point anchor to the trigger. Floating UI flips and shifts at the
  viewport edges.
- Focus moves into the menu on open (the menu gets `tabindex="-1"`) and
  returns to the trigger on close. The trigger gets no `aria-expanded` or
  `.show`, since it is an area rather than a button.
- A right-click inside the open menu keeps it; one elsewhere closes context
  menus (respecting `autoClose`) while click-opened menus stay, and a
  context menu closes every open menu when it opens.
- `menu` accepts a selector (`data-coreui-menu="#id"`) for... (continued)

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