feat(api): add stats chart endpoint for admin access with time series data

feat(dayjs): integrate dayjs for date handling and formatting across the application
refactor(routes): update date handling in id-tags, transactions, users, and dashboard routes to use dayjs
style(globals): improve CSS variable definitions for better readability and consistency
deps: add dayjs as a dependency for date manipulation

apps/web/app/dashboard/users/page.tsx

@@ -20,6 +20,7 @@ import {
 import { CreditCard, Pencil, ArrowRotateRight } from "@gravity-ui/icons";
 import { api, type IdTag, type UserRow } from "@/lib/api";
 import { useSession } from "@/lib/auth-client";
+import dayjs from "@/lib/dayjs";
 
 type CreateForm = {
   name: string;
@@ -452,7 +453,7 @@ export default function UsersPage() {
                     )}
                   </Table.Cell>
                   <Table.Cell className="text-sm">
-                    {new Date(u.createdAt).toLocaleString("zh-CN")}
+                    {dayjs(u.createdAt).format("YYYY/M/D HH:mm:ss")}
                   </Table.Cell>
                   <Table.Cell>
                     <div className="flex justify-end gap-1">