fix(pick): ignore universal-mode strums while playback is running

The pick only starts the piece. A later strum must not restart the preamble or change the chord.

Co-authored-by: Cursor <cursoragent@cursor.com>

Global/Global.c

@@ -1708,6 +1708,16 @@ void Pick_Handle()
     return;
   }
 
+  /* 万能（及设置页沿用万能）：拨片只负责启动。播放行进中再拨不换和弦、不重开前奏。 */
+  if (StartFlag &&
+      (mGuiData[GUI_TAB_INDEX].Current == 0 ||
+       (mGuiData[GUI_TAB_INDEX].Current == 3 &&
+        mGuiData[GUI_TAB_LAST_INDEX].Current == 0)))
+  {
+    LOG_I("pick", "universal skip: already started");
+    return;
+  }
+
   /* 左手未触发和弦板（或落在拍速/停止键）时：拨片默认发当前调一级大和弦伴奏。
    * 普通无指板也可起奏：用专业/普通记下的最后指板和弦，无记录才退回一级；无操作则偶拍停。 */
   {