feat(note_icon): add an empty option (closes #7370)

Author: eliandoran

apps/client/src/widgets/icon_list.ts

@@ -147,6 +147,12 @@ const categories: Category[] = [
 ];
 
 const icons: Icon[] = [
+    {
+        name: "empty",
+        slug: "empty",
+        category_id: 113,
+        type_of_icon: "REGULAR"
+    },
     {
         name: "child",
         slug: "child-regular",

apps/client/src/widgets/note_icon.css

@@ -56,4 +56,16 @@
 
 .note-icon-widget .icon-list span:hover {
     border: 1px solid var(--main-border-color);
+}
+
+.note-icon-widget .icon-list span.bx-empty {
+    width: unset;
+}
+
+.note-icon-widget .icon-list span.bx-empty::before {
+    display: inline-block;
+    content: "";
+    border: 1px dashed var(--muted-text-color);
+    width: 1em;
+    height: 1em;
 }