Switch from FastLED to Adafruit NeoPixel (more reliable on ESP32-S3 RMT)

include/pixel_stomp_mux.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include <cstdint>
-#include <FastLED.h>
+#include <Adafruit_NeoPixel.h>
 
 class PixelStompMux {
 public:
@@ -29,8 +29,6 @@ private:
     uint8_t pin_clk;
     uint8_t pin_di;
 
-    CRGB leds[NUM_LEDS];
+    Adafruit_NeoPixel strip;
     uint8_t last_button_state;
-
-    uint8_t shift_in_74hc165();
 };