macos: fix uikit build

macos/Sources/Ghostty/SurfaceView_UIKit.swift

@@ -46,6 +46,9 @@ extension Ghostty {
         
         /// True when the surface is in readonly mode.
         @Published private(set) var readonly: Bool = false
+        
+        /// True when the surface should show a highlight effect (e.g., when presented via goto_split).
+        @Published private(set) var highlighted: Bool = false
 
         // Returns sizing information for the surface. This is the raw C
         // structure because I'm lazy.

macos/Sources/Helpers/Extensions/String+Extension.swift

@@ -7,7 +7,7 @@ extension String {
         return self.prefix(maxLength) + trailing
     }
 
-    #if canImport(AppKit)
+#if canImport(AppKit)
     func temporaryFile(_ filename: String = "temp") -> URL {
         let url = FileManager.default.temporaryDirectory
             .appendingPathComponent(filename)
@@ -16,7 +16,6 @@ extension String {
         try? string.write(to: url, atomically: true, encoding: .utf8)
         return url
     }
-    #endif
 
     /// Returns the path with the home directory abbreviated as ~.
     var abbreviatedPath: String {
@@ -26,4 +25,5 @@ extension String {
         }
         return self
     }
+#endif
 }