Add schedule preview dropdown styles and various improvements

- Add .schedule-preview-dropdown and .schedule-preview-item CSS classes
- Add .btn-schedule-preview badge styling
- Add preview functionality for entity list views
- Improve modal and dropdown styling
- Various JS and SCSS enhancements

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

assets/css/admin/entity-selector.css

@@ -8579,6 +8579,67 @@ 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