feat: Make card descriptions expandable

client/src/components/common/ExpandableMarkdown/ExpandableMarkdown.module.scss

@@ -0,0 +1,28 @@
+/*!
+ * Copyright (c) 2024 PLANKA Software GmbH
+ * Licensed under the Fair Use License: https://github.com/plankanban/planka/blob/master/LICENSE.md
+ */
+
+:global(#app) {
+  .toggleButton {
+    box-shadow: none;
+    font-weight: normal;
+    margin-top: 8px;
+    padding: 6px 11px;
+    text-align: center;
+  }
+
+  .wrapper {
+    overflow: hidden;
+  }
+
+  .wrapperExpanded {
+    max-height: none !important;
+    overflow: visible;
+  }
+
+  .wrapperPartHidden {
+    mask-image: linear-gradient(180deg, #000 80%, transparent);
+    -webkit-mask-image: linear-gradient(180deg, #000 80%, transparent);
+  }
+}