Fix boot sequence: initialize SD card before display driver to prevent SD_MMC from overwriting LCD CS pin matrix settings

sound_picture_app/sound_picture_app.ino

@@ -100,14 +100,14 @@ void setup() {
   printf("  Memory Frame v2.0\r\n");
   printf("============================\r\n");
 
-  // Display on first
-  LCD_Init();
-  Set_Backlight(90);
-
-  // SD card
+  // SD card first (so SD_MMC driver does not overwrite LCD CS pin 21)
   Flash_test();
   SD_Init();
 
+  // Display second
+  LCD_Init();
+  Set_Backlight(90);
+
   // Load memories from config
   Config_Load();