单词列表卡片增加学习按钮，点击跳转拼写练习

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

LearnEnglish/LearnEnglish/Views/WordCardCell.swift

@@ -5,10 +5,12 @@ final class WordCardCell: UITableViewCell {
     private let wordLabel = UILabel()
     private let phoneticLabel = UILabel()
     private let meaningLabel = UILabel()
+    private let learnButton = UIButton(type: .system)
     private let speakerButton = UIButton(type: .system)
     private var word: Word?
 
     var onSpeak: ((Word) -> Void)?
+    var onLearn: ((Word) -> Void)?
 
     var zoomSourceView: UIView { cardView }
 
@@ -39,6 +41,15 @@ final class WordCardCell: UITableViewCell {
         textStack.axis = .vertical
         textStack.spacing = 8
 
+        learnButton.setImage(UIImage(systemName: "book",
+                                     withConfiguration: UIImage.SymbolConfiguration(pointSize: 15, weight: .medium)),
+                             for: .normal)
+        learnButton.tintColor = Theme.Color.accent
+        learnButton.addAction(UIAction { [weak self] _ in
+            guard let self, let word else { return }
+            onLearn?(word)
+        }, for: .touchUpInside)
+
         speakerButton.tintColor = Theme.Color.accent
         speakerButton.addAction(UIAction { [weak self] _ in
             guard let self, let word else { return }
@@ -46,7 +57,7 @@ final class WordCardCell: UITableViewCell {
         }, for: .touchUpInside)
         speakerButton.setContentHuggingPriority(.required, for: .horizontal)
 
-        let row = UIStackView(arrangedSubviews: [textStack, speakerButton])
+        let row = UIStackView(arrangedSubviews: [textStack, learnButton, speakerButton])
         row.axis = .horizontal
         row.alignment = .center
         row.spacing = 8
@@ -57,6 +68,8 @@ final class WordCardCell: UITableViewCell {
             row.leadingAnchor.constraint(equalTo: cardView.leadingAnchor, constant: 14),
             row.trailingAnchor.constraint(equalTo: cardView.trailingAnchor, constant: -8),
             row.bottomAnchor.constraint(equalTo: cardView.bottomAnchor, constant: -10),
+            learnButton.widthAnchor.constraint(equalToConstant: 44),
+            learnButton.heightAnchor.constraint(equalToConstant: 44),
             speakerButton.widthAnchor.constraint(equalToConstant: 44),
             speakerButton.heightAnchor.constraint(equalToConstant: 44)
         ])

LearnEnglish/LearnEnglish/Views/WordListViewController.swift

@@ -148,6 +148,11 @@ extension WordListViewController: UITableViewDataSource, UITableViewDelegate {
         cell.onSpeak = { word in
             SpeechService.shared.speak(word.word)
         }
+        cell.onLearn = { [weak self] word in
+            guard let self else { return }
+            let config = QuizConfig(mode: .spelling, words: [word], isStudyMode: true)
+            navigationController?.pushViewController(QuizViewController(config: config), animated: true)
+        }
         return cell
     }