build fixes

Sources/Controllers/PreviewWindowController.swift

@@ -1,4 +1,5 @@
 import AppKit
+import UniformTypeIdentifiers
 
 /// SPEC §9 — three-pane window: thumbnails | canvas | inspector.
 
@@ -211,7 +212,15 @@ final class PreviewWindowController: NSWindowController {
         let panel = NSOpenPanel()
         panel.allowsMultipleSelection = true
         panel.canChooseDirectories = false
+        if #available(macOS 12.0, *) {
+            var types: [UTType] = [.tiff, .json]
+            if let jobType = UTType(filenameExtension: "targetjob") {
+                types.append(jobType)
+            }
+            panel.allowedContentTypes = types
+        } else {
             panel.allowedFileTypes = ["tif", "tiff", "targetjob", "json"]
+        }
         panel.begin { result in
             if result == .OK { completion(panel.urls) }
         }

Sources/Printing/ColorMatching.swift

@@ -82,12 +82,17 @@ enum ColorMatching {
     static func stripColorMatchingAccessories(from panel: NSPrintPanel) {
         let accessories = panel.accessoryControllers
         for ac in accessories {
-            let title = (ac.title ?? "") + " " + (ac.nibName ?? "")
+            let cls = NSStringFromClass(type(of: ac))
+            let title = (ac.title ?? "") + " " + (ac.nibName ?? "") + " " + cls
             let hay = title.lowercased()
             if hay.contains("color matching") || hay.contains("colour matching") || hay.contains("colormatch") {
-                panel.removeAccessoryController(ac)
+                // SDK types this as NSViewController; removeAccessoryController
+                // requires NSPrintPanelAccessorizing (SPEC §7.2).
+                if let accessor = ac as? (NSViewController & NSPrintPanelAccessorizing) {
+                    panel.removeAccessoryController(accessor)
                     TPLog.info("Removed print-panel accessory: \(title)")
                 }
             }
         }
+    }
 }