feat(KAN-55): support app links, file selection and clipboard

native/src-tauri/gen/apple/Sources/kanbangit-native/WorkspaceViewController.swift

@@ -39,6 +39,7 @@ final class WorkspaceViewController: UIViewController, WKNavigationDelegate, WKU
     private let connectButton = UIButton(type: .system)
     private let resumeButton = UIButton(type: .system)
     private let toolbar = UIToolbar()
+    private var historyObservation: NSKeyValueObservation?
     private var backButton: UIBarButtonItem!
     private var appearance: UISegmentedControl!
 
@@ -192,6 +193,7 @@ final class WorkspaceViewController: UIViewController, WKNavigationDelegate, WKU
         guard let data = try? JSONEncoder().encode(selected) else { status.text = text("storageError"); return }
         defaults.set(data, forKey: serverKey)
         timeout?.cancel()
+        historyObservation = nil
         workspace?.stopLoading()
         workspace?.navigationDelegate = nil
         workspace?.removeFromSuperview()
@@ -215,6 +217,9 @@ final class WorkspaceViewController: UIViewController, WKNavigationDelegate, WKU
             webview.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
         ])
         workspace = webview
+        historyObservation = webview.observe(\.canGoBack, options: [.initial, .new]) { [weak self] view, _ in
+            self?.backButton.isEnabled = view.canGoBack
+        }
         view.endEditing(true)
         address.text = url.absoluteString
         beginNavigation()
@@ -261,8 +266,17 @@ final class WorkspaceViewController: UIViewController, WKNavigationDelegate, WKU
     @objc private func goBack() { if workspace?.canGoBack == true { workspace?.goBack() } }
 
     func webView(_ webView: WKWebView, decidePolicyFor action: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
-        guard webView === workspace, let url = action.request.url,
-              server?.allows(url) == true else { decisionHandler(.cancel); return }
+        guard webView === workspace, let url = action.request.url else { decisionHandler(.cancel); return }
+        guard server?.allows(url) == true else {
+            decisionHandler(.cancel)
+            if action.navigationType == .linkActivated,
+               action.sourceFrame.isMainFrame,
+               action.targetFrame == nil || action.targetFrame?.isMainFrame == true,
+               WorkspaceServer.allowsExternal(url) {
+                UIApplication.shared.open(url)
+            }
+            return
+        }
         if action.targetFrame == nil {
             decisionHandler(.cancel)
             webView.load(action.request)