macos: dummy search state for iOS

macos/Sources/Ghostty/SurfaceView.swift

@@ -413,7 +413,9 @@ extension Ghostty {
                     .cornerRadius(6)
                     .focused($isSearchFieldFocused)
                     .onExitCommand {
+                        #if canImport(AppKit)
                         Ghostty.moveFocus(to: surfaceView)
+                        #endif
                     }
                     .backport.onKeyPress(.return) { modifiers in
                         guard let surface = surfaceView.surface else { return .ignored }

macos/Sources/Ghostty/SurfaceView_UIKit.swift

@@ -40,6 +40,9 @@ extension Ghostty {
 
         /// True when the bell is active. This is set inactive on focus or event.
         @Published var bell: Bool = false
+        
+        // The current search state. When non-nil, the search overlay should be shown.
+        @Published var searchState: SearchState? = nil
 
         // Returns sizing information for the surface. This is the raw C
         // structure because I'm lazy.