style: update workspace navigation grid to six columns

frontend/src/app/components/workspace-navigation/workspace-navigation.css

@@ -24,7 +24,7 @@
 .navigation-items {
 	display: grid;
 	height: 100%;
-	grid-template-columns: repeat(5, minmax(0, 1fr));
+	grid-template-columns: repeat(6, minmax(0, 1fr));
 	gap: 4px;
 }