macOS: move `healthy` and `error` to `OSSurfaceView`

macos/Sources/Ghostty/Surface View/OSSurfaceView.swift

@@ -18,6 +18,13 @@ extension Ghostty {
         // resized in discrete steps of a single cell.
         @Published var cellSize: CGSize = .zero
 
+        // The health state of the surface. This currently only reflects the
+        // renderer health. In the future we may want to make this an enum.
+        @Published var healthy: Bool = true
+
+        // Any error while initializing the surface.
+        @Published var error: Error?
+
         init(id: UUID?, frame: CGRect) {
             self.id = id ?? UUID()
             super.init(frame: frame)

macos/Sources/Ghostty/Surface View/SurfaceView_AppKit.swift

@@ -21,13 +21,6 @@ extension Ghostty {
             }
         }
 
-        // The health state of the surface. This currently only reflects the
-        // renderer health. In the future we may want to make this an enum.
-        @Published var healthy: Bool = true
-
-        // Any error while initializing the surface.
-        @Published var error: Error?
-
         // The hovered URL string
         @Published var hoverUrl: String?
 

macos/Sources/Ghostty/Surface View/SurfaceView_UIKit.swift

@@ -9,13 +9,6 @@ extension Ghostty {
         // to the app level and it is set from there.
         @Published var title: String = "👻"
 
-        // The health state of the surface. This currently only reflects the
-        // renderer health. In the future we may want to make this an enum.
-        @Published var healthy: Bool = true
-
-        // Any error while initializing the surface.
-        @Published var error: Error?
-
         // The hovered URL
         @Published var hoverUrl: String?