Я уже не помню что там было

src/App.jsx

@@ -1,45 +1,78 @@
-import React, { useMemo, useCallback, useState } from 'react'
+import { useState, createContext, useContext } from 'react'
+import styles from './App.module.scss'
 
-const TodoItem = React.memo(({ item, onToggle, onDelete }) => {
-    console.log(`rendred ${item.id}`);
-    return <li>
-            {item.name}
-            <button onClick={() => onToggle(item.id)}>Done</button>
-            <button onClick={() => onDelete(item.id)}>remove</button>
-        </li>
-})
+const UserContext = createContext('')
 
-function ItemList({ items }) {
+function UserProvider({ children }) {
+    const [name,setName] = useState('');
     
-    const handleToggle = useCallback(id => {
-        items.done = true;
-        console.log(`Item ${id} done`)
-        console.log(id)
-    },[]);
+    const toggleName = (newName) => {
+        setName(newName);
+    }
     
-    const handleDelete = useCallback(id => {
-        items.pop(id);
-    },[]);
     return (
-        <>
-            <h3>List items</h3>
-            {items.map(item => (
-             <TodoItem key={item.id} item={item}
-              onToggle={handleToggle} onDelete={handleDelete} />
-             ))}
-        </>
+        <UserContext.Provider value={{name, toggleName}}>
+            {children}
+        </UserContext.Provider>
+    )
+}
+
+function Form() {
+    const {name, toggleName} = useContext(UserContext)
+    const [newName,setNewName] = useState('');
+    const handleSubmit = (event) => {
+        event.preventDefault();
+        toggleName(event.target[0].value)
+    }
+    const handlerChange = (event) => {
+        setNewName(event.target.value);
+    }
+    return (
+        <form onSubmit={handleSubmit}>
+        <input type='text' value={newName} onChange={handlerChange} />
+        <button type='submit'>Войти</button>
+        </form>
+    )
+}
+
+function ExitButton() {
+    const {name, toggleName} = useContext(UserContext)
+    
+    return (
+        <button onClick={() => toggleName('')}>Выход</button>
+    )
+}
+
+function Toolbar() {
+    const {name, toggleName} = useContext(UserContext)
+    return(
+        <div className={styles.container}>
+            <h3>Панель пользователя</h3>
+            {name && `Привет ${name}`}
+            {name ? <ExitButton /> : <Form /> }
+            
+        </div>
+    )
+}
+
+function Page() {
+    return (
+        <div>
+            <h1 style={{textAlign: 'center'}}>Главная страница</h1>
+            <Toolbar />
+        </div>
     )
 }
 
 function App() {    
+    
 	return (
 		<>
 			{/* Добавьте тестовый контент для проверки */}
 			<h1>Hello, React!</h1>
-            <ItemList items={[
-                {id:1,name:'Первый',done:false},
-                {id:2,name:'Второй',done:false}
-            ]} />
+        <UserProvider>
+            <Page />
+        </UserProvider>
 		</>
 	)
 }

src/App.module.scss

@@ -0,0 +1,13 @@
+.container {
+    height: 500px;
+    border: 1px solid black;
+    border-radius: 10px;
+    background-color: lightblue;
+}
+.item {
+    font-size: 16pt;
+    border: 1px dotted gray;
+    /*margin: 5px 10px;
+    padding: 10px;*/
+    border-radius: 5px;
+}

src/main.jsx

@@ -4,5 +4,7 @@ import { createRoot } from 'react-dom/client'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(
+	<StrictMode>
 		<App />
+	</StrictMode>
 )