Optimize boot order: initialize display and NeoPixel first

sound_picture_app/sound_picture_app.ino

@@ -50,14 +50,16 @@ void setup() {
   
   // Setup NeoPixel
   pinMode(PIN_NEOPIXEL, OUTPUT);
-  neopixelWrite(PIN_NEOPIXEL, 0, 0, 0); // turn off initially
+  neopixelWrite(PIN_NEOPIXEL, 0, 0, 32); // Turn on solid blue to show booting
   
-  // Initialize peripherals
-  Flash_test();
-  SD_Init();
+  // Initialize Display and Backlight first so the screen lights up immediately
   LCD_Init();
   Set_Backlight(90);
   
+  // Initialize other peripherals
+  Flash_test();
+  SD_Init();
+  
   // Setup button
   pinMode(BOOT_KEY_PIN, INPUT_PULLUP);