feat: pass beat times to native player

app/src/main/java/at/lockstep/player/pasada/LibPasada.java

@@ -37,8 +37,14 @@ public final class LibPasada {
      * @param fd open read FD (Java retains ownership; do not close until track changes)
      * @param offset start offset within the FD (0 for whole file)
      * @param length byte length from offset ({@code -1} if unknown / to EOF)
+     * @param beatTimesSec beat times in seconds from track start, or {@code null} when unknown
      */
-    public static native void play(int fd, long offset, long length);
+    public static native void play(int fd, long offset, long length, double[] beatTimesSec);
+
+    /** Same as {@link #play(int, long, long, double[])} with no beat annotation. */
+    public static void play(int fd, long offset, long length) {
+        play(fd, offset, length, null);
+    }
 
     /** PLAYING → PAUSED (silent output, graph kept alive). */
     public static native void pause();