refactor: remove backward compatibility styles from ActionButtonGrid

Author: atyrode

src/frontend/src/pad/buttons/ActionButtonGrid.scss

@@ -64,49 +64,3 @@
     transform-origin: center;
   }
 }
-
-/* Animation styles */
-.action-button-grid {
-  &__item {
-    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Use a nice easing for the expansion */
-  }
-  
-  &__item--expanded {
-    transform: scale(1.02); /* Slightly larger when expanded */
-    transition-delay: 0.1s; /* Small delay before expanding */
-  }
-}
-
-/* Related component animations when parent is expanded */
-.action-button-grid__item--expanded {
-  .action-button__wrapper {
-    transform: scale(1);
-    opacity: 1;
-    transition: all 0.4s ease-in-out;
-  }
-  
-  .action-tabs__container {
-    animation: fadeIn 0.4s ease-in-out 0.2s; /* Delay the animation to start after the button expands */
-    animation-fill-mode: both; /* Keep the final state */
-  }
-  
-  .action-button__container {
-    transition: all 0.4s ease-in-out;
-  }
-}
-
-/* For backward compatibility - can be removed once all code is updated */
-.action-button-grid__item.expanded {
-  @extend .action-button-grid__item--expanded;
-}
-
-@keyframes fadeIn {
-  from {
-    opacity: 0;
-    transform: translateY(-10px);
-  }
-  to {
-    opacity: 1;
-    transform: translateY(0);
-  }
-}