调整确认按钮尺寸、圆角、键盘间距，支持横竖屏适配

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

LearnEnglish/LearnEnglish/Views/SpellingInputView.swift

@@ -58,12 +58,14 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         addSubview(hiddenField)
 
         let accessory = UIView()
-        accessory.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 52)
+        accessory.frame = CGRect(x: 0, y: 0, width: 0, height: 74)
+        accessory.autoresizingMask = .flexibleWidth
         accessory.backgroundColor = .clear
 
         var glassConfig = UIButton.Configuration.glass()
         glassConfig.title = "确认"
         glassConfig.cornerStyle = .fixed
+        glassConfig.background.cornerRadius = 25
         glassConfig.baseForegroundColor = .label
         glassConfig.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { incoming in
             var outgoing = incoming
@@ -78,9 +80,9 @@ final class SpellingInputView: UIView, UITextFieldDelegate {
         accessory.addSubview(glassButton)
         NSLayoutConstraint.activate([
             glassButton.trailingAnchor.constraint(equalTo: accessory.trailingAnchor, constant: -15),
-            glassButton.centerYAnchor.constraint(equalTo: accessory.centerYAnchor),
-            glassButton.widthAnchor.constraint(equalToConstant: 60),
-            glassButton.heightAnchor.constraint(equalToConstant: 44)
+            glassButton.topAnchor.constraint(equalTo: accessory.topAnchor, constant: 12),
+            glassButton.widthAnchor.constraint(equalToConstant: 80),
+            glassButton.heightAnchor.constraint(equalToConstant: 50)
         ])
         hiddenField.inputAccessoryView = accessory