Fix #3838: Improve menu accessibility

- Adds support for accessibility escape while VoiceOver is active
- Increases the top inset so there is always space to tap to dismiss the menu

Client/Frontend/Browser/Toolbars/BottomToolbar/Menu/Bookmarks/BookmarksViewController.swift

@@ -536,6 +536,11 @@ class BookmarksViewController: SiteTableViewController, ToolbarUrlActionsProtoco
             self.navigationController?.pushViewController(vc, animated: true)
         }
     }
+
+    override func accessibilityPerformEscape() -> Bool {
+        dismiss(animated: true)
+        return true
+    }
 }
 
 extension BookmarksViewController: BookmarksV2FetchResultsDelegate {

Client/Frontend/Browser/Toolbars/BottomToolbar/Menu/MenuViewController.swift

@@ -160,6 +160,11 @@ class MenuViewController: UINavigationController, UIPopoverPresentationControlle
     private var isPresentingInnerMenu: Bool {
         presentedViewController is InnerMenuNavigationController
     }
+
+    override func accessibilityPerformEscape() -> Bool {
+        dismiss(animated: true)
+        return true
+    }
 }
 
 extension MenuViewController: PanModalPresentable {
@@ -198,7 +203,7 @@ extension MenuViewController: PanModalPresentable {
         return _scrollViewChild(in: topVC.view)
     }
     var longFormHeight: PanModalHeight {
-        .maxHeight
+        .maxHeightWithTopInset(32)
     }
     var shortFormHeight: PanModalHeight {
         isPresentingInnerMenu ? .maxHeight : .contentHeight(initialHeight)