remove lessonTitleText in training module

ios/OralTrainer/Views/FullscreenPlayerView.swift

@@ -3,6 +3,7 @@ import SwiftUI
 /// 与安卓端横屏布局一致：全屏播放 + 半透明句面板 + 退出全屏按钮。
 struct FullscreenPlayerView: View {
     @ObservedObject var controller: PlayerController
+    var showsLessonTitle: Bool = true
     let onExit: () -> Void
 
     @State private var subtitleVisible = true
@@ -55,10 +56,12 @@ struct FullscreenPlayerView: View {
                 Spacer()
                 if subtitleVisible {
                     VStack(alignment: .leading, spacing: 6) {
-                        Text(controller.currentItem?.title ?? "未选择课程")
-                            .font(.system(size: 17, weight: .bold))
-                            .foregroundColor(.white)
-                            .lineLimit(1)
+                        if showsLessonTitle {
+                            Text(controller.currentItem?.title ?? "未选择课程")
+                                .font(.system(size: 17, weight: .bold))
+                                .foregroundColor(.white)
+                                .lineLimit(1)
+                        }
                         Text(sentenceMetaText)
                             .font(.system(size: 13))
                             .foregroundColor(Theme.textOverlay)