style/note cards: remove shadow

Author: adoriandoran

apps/client/src/stylesheets/theme-next/base.css

@@ -487,7 +487,6 @@ li.dropdown-item a.dropdown-item-button:focus-visible {
     --note-list-vertical-padding: 15px;
     background-color: var(--card-background-color);
     border: 1px solid var(--card-border-color) !important;
-    box-shadow: 2px 3px 4px var(--card-shadow-color);
     border-radius: 12px;
     user-select: none;
     padding: 0;