feat: draggable progress bar (seek) and settings sliders

app/src/main/java/top/yeij/hearth/media/MediaSessionSource.kt

@@ -154,6 +154,13 @@ class MediaSessionSource(context: Context) {
         Log.d(TAG, "playPause: index=$index playing=$playing")
     }
 
+    // 拖动进度条 seek 到指定位置（毫秒）
+    // Seek to the given position (ms) when dragging the progress bar
+    fun seekTo(index: Int, position: Long) {
+        controllers.getOrNull(index)?.transportControls?.seekTo(position)
+        Log.d(TAG, "seekTo: index=$index position=$position")
+    }
+
     // 跳转到指定会话的播放界面：优先 sessionActivity（PendingIntent），
     // 失败则回退到启动该 App
     // Jump to the session's playback UI: prefer sessionActivity (PendingIntent),

app/src/main/java/top/yeij/hearth/webview/JsBridge.kt

@@ -355,6 +355,13 @@ class JsBridge(
         mediaSourceRef?.next(index)
     }
 
+    // 拖动进度条 seek 到指定位置（毫秒）
+    // Seek to the given position (ms) when dragging the progress bar
+    @android.webkit.JavascriptInterface
+    fun mediaSeekTo(index: Int, position: Long) {
+        mediaSourceRef?.seekTo(index, position)
+    }
+
     // 跳转到指定会话的播放界面（封面点击）
     // Jump to the session's playback UI (cover tap)
     @android.webkit.JavascriptInterface