import React, { useState } from 'react'; import MemberList from './components/MemberList'; import MemberForm from './components/MemberForm'; import ExcelImportExport from './components/ExcelImportExport'; function App() { const [members, setMembers] = useState([]); const [editingMember, setEditingMember] = useState(null); const addMember = (member) => { setMembers([...members, { ...member, id: Date.now() }]); }; const updateMember = (updatedMember) => { setMembers(members.map(m => m.id === updatedMember.id ? updatedMember : m)); setEditingMember(null); }; const deleteMember = (id) => { setMembers(members.filter(m => m.id !== id)); }; const handleImport = (importedMembers) => { setMembers([...members, ...importedMembers.map(m => ({ ...m, id: Date.now() + Math.random() }))]); }; return (