update palette on selection

script.js

@@ -8,6 +8,7 @@ import init, {
     output,
     set_brightness,
     set_dither,
+    set_palette,
     set_room_name,
 } from './pkg/pixsy.js';
 
@@ -171,6 +172,11 @@ async function run() {
     buttonImageProceed.addEventListener("click",    handleImage);
     buttonImageProceed.addEventListener("touchend", handleImage);
 
+    selectPalette.addEventListener("change", () => {
+        set_palette(selectPalette.value);
+        loadPreview();
+    });
+
     checkboxDither.addEventListener("change", () => {
         set_dither(checkboxDither.checked);
         loadPreview();