确认按钮仅在学习模式显示

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

LearnEnglish/LearnEnglish/Views/QuizViewController.swift

@@ -227,6 +227,7 @@ final class QuizViewController: UIViewController {
                 }
                 spellingView.confirmButton?.isEnabled = false
             } else {
+                spellingView.hideAccessoryView()
                 spellingView.onChange = { [weak self] in
                     guard let self else { return }
                     nextButton.isEnabled = spellingView.isComplete

LearnEnglish/LearnEnglish/Views/SpellingInputView.swift

@@ -127,6 +127,11 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         refreshBoxes()
     }
 
+    func hideAccessoryView() {
+        confirmButton?.isHidden = true
+        hiddenField.inputAccessoryView = nil
+    }
+
     func showResultState(correct: Bool) {
         let color = correct ? Theme.Color.correct : Theme.Color.wrong
         for position in blankPositions {