horizontal scrolling where applicable can now be done via vertical mousewheel movement

src/apps/dashboard/static/apps/dashboard/dashboard.js

@@ -9,6 +9,15 @@ const initialize = (inputSelector) => {
     };
 };
 
+const bindPaletteWheel = () => {
+    document.querySelectorAll('.palette-scroll').forEach(el => {
+        el.addEventListener('wheel', (e) => {
+            e.preventDefault();
+            el.scrollLeft += e.deltaY;
+        }, { passive: false });
+    });
+};
+
 const bindPaletteForms = () => {
     document.querySelectorAll('form[action*="set_palette"]').forEach(form => {
         form.addEventListener("submit", async (e) => {