Remove schedule-specific styles, use shared mpr-dropdown-preview

Schedule preview now uses mpr-dropdown-preview from prestashop-admin package.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/admin/entity-selector.css

@@ -8579,67 +8579,6 @@ body > .target-search-dropdown .dropdown-item:not(:last-child) {
   opacity: 0.9;
 }
 
-.schedule-preview-dropdown {
-  display: none;
-  position: absolute;
-  top: 100%;
-  left: 50%;
-  transform: translateX(-50%);
-  margin-top: 4px;
-  z-index: 1000;
-  min-width: 180px;
-  padding: 0.5rem;
-  background: #ffffff;
-  border: 1px solid #dee2e6;
-  border-radius: 0.25rem;
-  box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.175);
-  font-size: 0.875rem;
-  text-align: left;
-  white-space: nowrap;
-}
-
-.schedule-preview-item {
-  display: flex;
-  align-items: flex-start;
-  gap: 0.5rem;
-  padding: 0.25rem 0;
-  color: #212529;
-}
-.schedule-preview-item .material-icons {
-  flex-shrink: 0;
-  font-size: 16px;
-  color: #6c757d;
-}
-.schedule-preview-item strong {
-  font-weight: 600;
-}
-.schedule-preview-item .schedule-time {
-  color: #6c757d;
-}
-
-.btn-schedule-preview {
-  position: relative;
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  gap: 0.25rem;
-  min-width: 20px;
-  height: 20px;
-  padding: 0 0.5rem;
-  background: #25b9d7;
-  color: #ffffff;
-  font-size: 0.75rem;
-  font-weight: 600;
-  border-radius: 50rem;
-  cursor: pointer;
-  text-transform: none;
-}
-.btn-schedule-preview .icon-eye {
-  font-size: 10px;
-  line-height: 1;
-  opacity: 0.8;
-}
-
 /**
  * Entity Selector Styles
  * @package prestashop-entity-selector