Calibrate touch from serial logs: invert physical X axis.

Bottom LVGL buttons were mapped to the top; add on-screen logic coordinate debug.

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

src/main.cpp

@@ -77,10 +77,11 @@ void loop() {
     refresh_sd_ui();
   }
 
-  // 播放过程中刷新按钮文字（Playing / Stop）
-  if (now - last_btn_ui_ms >= 300) {
+  // 播放过程中刷新按钮文字；同步触点调试
+  if (now - last_btn_ui_ms >= 200) {
     last_btn_ui_ms = now;
     ui_refresh_audio_buttons();
+    ui_set_touch_debug(g_dbg_logic_x, g_dbg_logic_y, g_dbg_touch_down);
   }
 
   delay(5);