Added a basic web UI

client/src/components/app-icon/index.tsx

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+import React from "react";
+
+export const AppIcon: React.FC = () => {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
+      viewBox="0 0 16 16"
+      fill="none"
+    >
+      <g fill="currentColor">
+        <path d="M8 6c4.418 0 8-1.343 8-3s-3.582-3-8-3-8 1.343-8 3 3.582 3 8 3z" />
+        <path d="M8 8c4.418 0 8-1.343 8-3v3c0 1.657-3.582 3-8 3S0 9.657 0 8V5c0 1.657 3.582 3 8 3z" />
+        <path d="M8 13c4.418 0 8-1.343 8-3v3c0 1.657-3.582 3-8 3s-8-1.343-8-3v-3c0 1.657 3.582 3 8 3z" />
+      </g>
+    </svg>
+  );
+};

client/src/components/header/index.tsx

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+import { DownOutlined } from "@ant-design/icons";
+import type { RefineThemedLayoutV2HeaderProps } from "@refinedev/antd";
+import { useGetIdentity, useGetLocale, useSetLocale } from "@refinedev/core";
+import {
+  Avatar,
+  Button,
+  Dropdown,
+  Layout as AntdLayout,
+  MenuProps,
+  Space,
+  Switch,
+  theme,
+  Typography,
+} from "antd";
+import React, { useContext } from "react";
+import { useTranslation } from "react-i18next";
+import { ColorModeContext } from "../../contexts/color-mode";
+
+const { Text } = Typography;
+const { useToken } = theme;
+
+type IUser = {
+  id: number;
+  name: string;
+  avatar: string;
+};
+
+export const Header: React.FC<RefineThemedLayoutV2HeaderProps> = ({
+  sticky,
+}) => {
+  const { token } = useToken();
+  const { i18n } = useTranslation();
+  const locale = useGetLocale();
+  const changeLanguage = useSetLocale();
+  const { data: user } = useGetIdentity<IUser>();
+  const { mode, setMode } = useContext(ColorModeContext);
+
+  const currentLocale = locale();
+
+  const menuItems: MenuProps["items"] = [...(i18n.languages || [])]
+    .sort()
+    .map((lang: string) => ({
+      key: lang,
+      onClick: () => changeLanguage(lang),
+      icon: (
+        <span style={{ marginRight: 8 }}>
+          <Avatar size={16} src={`/images/flags/${lang}.svg`} />
+        </span>
+      ),
+      label: lang === "en" ? "English" : "German",
+    }));
+
+  const headerStyles: React.CSSProperties = {
+    backgroundColor: token.colorBgElevated,
+    display: "flex",
+    justifyContent: "flex-end",
+    alignItems: "center",
+    padding: "0px 24px",
+    height: "64px",
+  };
+
+  if (sticky) {
+    headerStyles.position = "sticky";
+    headerStyles.top = 0;
+    headerStyles.zIndex = 1;
+  }
+
+  return (
+    <AntdLayout.Header style={headerStyles}>
+      <Space>
+        <Dropdown
+          menu={{
+            items: menuItems,
+            selectedKeys: currentLocale ? [currentLocale] : [],
+          }}
+        >
+          <Button type="text">
+            <Space>
+              <Avatar size={16} src={`/images/flags/${currentLocale}.svg`} />
+              {currentLocale === "en" ? "English" : "German"}
+              <DownOutlined />
+            </Space>
+          </Button>
+        </Dropdown>
+        <Switch
+          checkedChildren="🌛"
+          unCheckedChildren="🔆"
+          onChange={() => setMode(mode === "light" ? "dark" : "light")}
+          defaultChecked={mode === "dark"}
+        />
+        <Space style={{ marginLeft: "8px" }} size="middle">
+          {user?.name && <Text strong>{user.name}</Text>}
+          {user?.avatar && <Avatar src={user?.avatar} alt={user?.name} />}
+        </Space>
+      </Space>
+    </AntdLayout.Header>
+  );
+};

client/src/components/index.ts

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+export { Header } from "./header";