fix: hide unimplemented buttons

app/src/components/ControlPalette.vue

@@ -1,11 +1,11 @@
 <template>
   <section class="h-[10%] p-3 grid grid-cols-3 gap-4 place-content-between">
-    <button id="solution" class="bg-background-secondary rounded-lg p-2">
+    <button id="solution" class="bg-disabled-background rounded-lg p-2">
       <font-awesome-icon
         :icon="['far', 'circle-question']"
-        class="text-text-primary"
+        class="text-disabled-text"
       />
-      <p class="text-text-primary inline">Solution</p>
+      <p class="text-disabled-text inline">Solution</p>
     </button>
     <button
       id="reset"