feat(ui): completed ui user multi role with temporary access

frontend/src/lib/fn/array.ts

@@ -0,0 +1,15 @@
+/**
+ * Sorts an array of items into groups. The return value is a map where the keys are
+ * the group ids the given getGroupId function produced and the value is an array of
+ * each item in that group.
+ */
+export const groupBy = <T, Key extends string | number | symbol>(
+	array: readonly T[],
+	getGroupId: (item: T) => Key
+): Record<Key, T[]> =>
+	array.reduce((acc, item) => {
+		const groupId = getGroupId(item);
+		if (!acc[groupId]) acc[groupId] = [];
+		acc[groupId].push(item);
+		return acc;
+	}, {} as Record<Key, T[]>);