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>

include/touch.h

@@ -1,6 +1,12 @@
 #pragma once
 
 #include <lvgl.h>
+#include <stdint.h>
 
 void touch_init();
 void touch_read_cb(lv_indev_t *indev, lv_indev_data_t *data);
+
+// 调试：最近一次触点（物理 / LVGL 旋转后逻辑）
+extern int16_t g_dbg_phys_x, g_dbg_phys_y;
+extern int16_t g_dbg_logic_x, g_dbg_logic_y;
+extern bool g_dbg_touch_down;

include/ui.h

@@ -5,3 +5,4 @@
 void ui_create();
 void ui_update(const SdCardInfo &info);
 void ui_refresh_audio_buttons();
+void ui_set_touch_debug(int16_t lx, int16_t ly, bool down);