fix(apple/tvOS): system fullscreen keyboard for all text entry — no inline fields

SwiftUI's inline TextField on tvOS is structurally wrong for television: it grows when
activated, shows a full-width editing surface behind the pill, and floats labels
off-center — none of it stylable into the Settings-app look. Per Apple's tvOS text
input guidance, real tvOS apps never edit inline: a field is a value ROW, and pressing
it raises the SYSTEM fullscreen keyboard.

- TVTextEntry (UIViewControllerRepresentable): a UITextField that becomesFirstResponder
  on appear, presenting the standard tvOS fullscreen keyboard with the field's prompt;
  done/dismiss commits the text. TVFieldRow is the Settings-style label+value lozenge.
- Add Host and PIN pairing on tvOS now use rows + keyboard covers exclusively (the
  port row also fixes the off-center value text for good — it's a Text, not a field);
  the port input validates 1...65535.
- No SwiftUI TextField remains in any tvOS code path.

Verified by screenshot: the dialog rows render exactly like the Settings app, and the
address row raises the system linear keyboard with prompt + done.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/apple/Sources/PunktfunkClient/TVTextEntry.swift

@@ -0,0 +1,90 @@
+// The native tvOS text-entry experience: real tvOS apps never edit text inline —
+// selecting a field presents the SYSTEM full-screen keyboard (Apple's "Designing the
+// Keyboard Input Experience"). UIKit gives that for free: a UITextField that becomes
+// first responder presents the fullscreen keyboard UI with the field's placeholder as
+// the prompt. SwiftUI's inline TextField on tvOS is an expanding pill with stray
+// chrome — this bridge replaces it everywhere on tvOS.
+
+#if os(tvOS)
+import SwiftUI
+import UIKit
+
+/// Present inside a fullScreenCover: immediately raises the system keyboard for one
+/// value, then calls `onDone` with the result (also on Menu-button dismissal, with
+/// whatever was typed so far — match the system apps' "edits stick" behavior).
+struct TVTextEntry: UIViewControllerRepresentable {
+    let title: String
+    let text: String
+    var keyboardType: UIKeyboardType = .default
+    let onDone: (String) -> Void
+
+    func makeUIViewController(context: Context) -> TVTextEntryController {
+        let controller = TVTextEntryController()
+        controller.configure(
+            title: title, text: text, keyboardType: keyboardType, onDone: onDone)
+        return controller
+    }
+
+    func updateUIViewController(_ controller: TVTextEntryController, context: Context) {}
+}
+
+final class TVTextEntryController: UIViewController, UITextFieldDelegate {
+    private let field = UITextField()
+    private var onDone: ((String) -> Void)?
+    private var finished = false
+
+    func configure(
+        title: String, text: String, keyboardType: UIKeyboardType,
+        onDone: @escaping (String) -> Void
+    ) {
+        field.placeholder = title
+        field.text = text
+        field.keyboardType = keyboardType
+        field.returnKeyType = .done
+        self.onDone = onDone
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.backgroundColor = .clear
+        field.delegate = self
+        view.addSubview(field) // must be in a window to become first responder
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        field.becomeFirstResponder() // presents the tvOS fullscreen keyboard
+    }
+
+    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
+        textField.resignFirstResponder()
+        return true
+    }
+
+    func textFieldDidEndEditing(_ textField: UITextField) {
+        guard !finished else { return }
+        finished = true
+        onDone?(textField.text ?? "")
+    }
+}
+
+/// A Settings-app-style value row: label leading, current value trailing — the whole
+/// row is one system lozenge, and pressing it opens the fullscreen keyboard.
+struct TVFieldRow: View {
+    let label: String
+    let value: String
+    let placeholder: String
+    let action: () -> Void
+
+    var body: some View {
+        Button(action: action) {
+            HStack {
+                Text(label)
+                Spacer()
+                Text(value.isEmpty ? placeholder : value)
+                    .foregroundStyle(.secondary)
+            }
+        }
+    }
+}
+#endif