macos: remove EventSinkHostingView

This was breaking various other features:

  - Popovers stopped working
  - Split divider drag gestures stopped working

For now we document the top part of the window is draggable... we
can look into removing that limitation later.

macos/Sources/Features/Terminal/TerminalController.swift

@@ -328,7 +328,7 @@ class TerminalController: NSWindowController, NSWindowDelegate,
         }
 
         // Initialize our content view to the SwiftUI root
-        window.contentView = EventSinkHostingView(rootView: TerminalView(
+        window.contentView = NSHostingView(rootView: TerminalView(
             ghostty: self.ghostty,
             viewModel: self,
             delegate: self

macos/Sources/Helpers/EventSinkHostingView.swift

@@ -1,21 +0,0 @@
-import SwiftUI
-
-/// Custom subclass of NSHostingView which sinks events so that we can
-/// stop the window from receiving events originating from within this view.
-class EventSinkHostingView<Content: View>: NSHostingView<Content> {
-    override var acceptsFirstResponder: Bool {
-        return true
-    }
-
-    override func becomeFirstResponder() -> Bool {
-        return true
-    }
-
-    override func acceptsFirstMouse(for event: NSEvent?) -> Bool {
-        return true
-    }
-
-    override var mouseDownCanMoveWindow: Bool {
-        return false
-    }
-}