fix(ios): prevent menu-dismissal taps from triggering underlying views

[arobdog]

Problem

On iOS, the tap that dismisses an open context menu is also delivered to the app window, so React Native pressables underneath it fire. Dismissing a menu by tapping elsewhere can press a button, select a row, or navigate - reported in #120, and reproducible in both dropdownMenuMode and the long-press flow.

Fix

While a menu is displayed, cover the window with a transparent UIView that consumes every touch, and remove it when the menu ends. The menu itself is unaffected (it lives in its own system window above the app's). This is the approach posted in #120's thread (credit to that diff), with two changes found necessary in production use:

• Removal is keyed to the configuration that actually displayed. The view attaches two menu interactions sharing one delegate (the dropdown tap path and the long-press path), and the interaction that never displayed also reaches willEndForConfiguration — on the long-press path this happens at finger release, while the menu is still open. Unguarded, that removes the scrim early (reintroducing the bug for long-press-opened menus) and fires a spurious onCancel. The same guard therefore also fixes onCancel firing while the menu is still visible.
• The scrim attaches to the window rather than the view controller's view, so content outside the hosting controller (e.g. a native tab bar) is covered too, and it's cleaned up in didMoveToWindow if the view unmounts while a menu is open.

Android needs no equivalent: its native menu consumes the outside-dismiss touch (verified on device).

Testing

Verified in a production React Native app (new architecture, RN 0.7x) on iOS simulator and devices: menus opened by tap and by long-press; dismissal taps on rows/buttons/tab bar only dismiss; menu item selection, onPress, and onCancel all behave as before; no scrim leak after unmount-while-open.

Closes #120

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