feat(users): build users management page

frontend/app/hooks/useUsers.ts

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+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import { getUsers, updateUserRole } from '../lib/api/usersApi';
+
+export function useUsers() {
+  return useQuery({ queryKey: ['users'], queryFn: getUsers });
+}
+
+export function useUpdateUserRole() {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: ({ id, role }: { id: string; role: string }) =>
+      updateUserRole(id, role),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['users'] });
+    },
+  });
+}

frontend/app/users/page.tsx

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+'use client';
+
+import React, { useState } from 'react';
+import { useUsers, useUpdateUserRole } from '../hooks/useUsers';
+import { Avatar } from '../../components/ui/Avatar';
+
+export default function UsersPage() {
+  const { data: users = [], isLoading } = useUsers();
+  const updateRole = useUpdateUserRole();
+
+  const [search, setSearch] = useState('');
+  const [roleFilter, setRoleFilter] = useState('');
+
+  if (isLoading) return <div>Loading...</div>;
+
+  const filteredUsers = users.filter((u: any) =>
+    (u.name.toLowerCase().includes(search.toLowerCase()) ||
+      u.email.toLowerCase().includes(search.toLowerCase())) &&
+    (roleFilter ? u.role === roleFilter : true)
+  );
+
+  return (
+    <div className="p-6">
+      <h1 className="text-xl font-bold mb-4">Users Management</h1>
+
+      <div className="flex gap-4 mb-4">
+        <input
+          type="text"
+          placeholder="Search by name or email"
+          value={search}
+          onChange={(e) => setSearch(e.target.value)}
+          className="border p-2"
+        />
+        <select
+          value={roleFilter}
+          onChange={(e) => setRoleFilter(e.target.value)}
+          className="border p-2"
+        >
+          <option value="">All Roles</option>
+          <option value="admin">Admin</option>
+          <option value="manager">Manager</option>
+          <option value="staff">Staff</option>
+        </select>
+      </div>
+
+      <table className="w-full border">
+        <thead>
+          <tr>
+            <th>Avatar + Name</th>
+            <th>Email</th>
+            <th>Role</th>
+            <th>Joined</th>
+          </tr>
+        </thead>
+        <tbody>
+          {filteredUsers.map((user: any) => (
+            <tr key={user.id}>
+              <td className="flex items-center gap-2">
+                <Avatar
+                  firstName={user.firstName}
+                  lastName={user.lastName}
+                  isCurrentUser={user.isCurrentUser}
+                />
+                {user.name}{' '}
+                {user.isCurrentUser && (
+                  <span className="ml-2 text-xs bg-gray-200 px-2 py-1 rounded">
+                    You
+                  </span>
+                )}
+              </td>
+              <td>{user.email}</td>
+              <td>
+                <select
+                  value={user.role}
+                  disabled={user.isCurrentUser}
+                  onChange={(e) =>
+                    updateRole.mutate({ id: user.id, role: e.target.value })
+                  }
+                  className="border p-1"
+                >
+                  <option value="admin">Admin</option>
+                  <option value="manager">Manager</option>
+                  <option value="staff">Staff</option>
+                </select>
+              </td>
+              <td>{new Date(user.joinedAt).toLocaleDateString()}</td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+
+      <div className="mt-4">
+        <h2 className="font-semibold">Role Legend</h2>
+        <ul>
+          <li>
+            <span className="text-red-600">Admin</span> — full access
+          </li>
+          <li>
+            <span className="text-blue-600">Manager</span> — manage teams
+          </li>
+          <li>
+            <span className="text-green-600">Staff</span> — standard user
+          </li>
+        </ul>
+      </div>
+    </div>
+  );
+}

frontend/components/ui/Avatar.tsx

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+import React from 'react';
+
+export function Avatar({
+  firstName,
+  lastName,
+  isCurrentUser,
+}: {
+  firstName: string;
+  lastName: string;
+  isCurrentUser?: boolean;
+}) {
+  const initials = `${firstName[0]}${lastName[0]}`.toUpperCase();
+  const bgColor = isCurrentUser ? 'bg-gray-800' : 'bg-gray-400';
+
+  return (
+    <div
+      className={`w-8 h-8 rounded-full flex items-center justify-center text-white ${bgColor}`}
+    >
+      {initials}
+    </div>
+  );
+}

frontend/lib/api/usersApi.ts

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+import api from './client';
+
+export async function getUsers() {
+  const res = await api.get('/api/users');
+  return res.data;
+}
+
+export async function updateUserRole(id: string, role: string) {
+  const res = await api.patch(`/api/users/${id}/role`, { role });
+  return res.data;
+}