Add keybind to change RGB effect

keymaps/custom/config.h

@@ -0,0 +1,42 @@
+#pragma once
+
+// Enable framebuffer effects (typing heatmap, digital rain)
+#define RGB_MATRIX_FRAMEBUFFER_EFFECTS
+
+// Standard effects (no additional defines needed)
+#define ENABLE_RGB_MATRIX_ALPHAS_MODS
+#define ENABLE_RGB_MATRIX_GRADIENT_UP_DOWN
+#define ENABLE_RGB_MATRIX_GRADIENT_LEFT_RIGHT
+#define ENABLE_RGB_MATRIX_BREATHING
+#define ENABLE_RGB_MATRIX_BAND_SAT
+#define ENABLE_RGB_MATRIX_BAND_VAL
+#define ENABLE_RGB_MATRIX_BAND_PINWHEEL_SAT
+#define ENABLE_RGB_MATRIX_BAND_PINWHEEL_VAL
+#define ENABLE_RGB_MATRIX_BAND_SPIRAL_SAT
+#define ENABLE_RGB_MATRIX_BAND_SPIRAL_VAL
+#define ENABLE_RGB_MATRIX_DUAL_BEACON
+#define ENABLE_RGB_MATRIX_RAINBOW_BEACON
+#define ENABLE_RGB_MATRIX_RAINBOW_PINWHEELS
+#define ENABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+#define ENABLE_RGB_MATRIX_HUE_BREATHING
+#define ENABLE_RGB_MATRIX_HUE_PENDULUM
+#define ENABLE_RGB_MATRIX_HUE_WAVE
+#define ENABLE_RGB_MATRIX_PIXEL_FRACTAL
+#define ENABLE_RGB_MATRIX_PIXEL_FLOW
+#define ENABLE_RGB_MATRIX_PIXEL_RAIN
+
+// Framebuffer effects (require RGB_MATRIX_FRAMEBUFFER_EFFECTS)
+#define ENABLE_RGB_MATRIX_TYPING_HEATMAP
+#define ENABLE_RGB_MATRIX_DIGITAL_RAIN
+
+// Reactive effects (require RGB_MATRIX_KEYPRESSES, already enabled in board config)
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_WIDE
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTIWIDE
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_CROSS
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTICROSS
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_NEXUS
+#define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTINEXUS
+#define ENABLE_RGB_MATRIX_SOLID_SPLASH
+#define ENABLE_RGB_MATRIX_SOLID_MULTISPLASH