feat(week05): complete week-05 assignment

week-05/dev/frontend/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

week-05/dev/frontend/README.md

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+This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+# or
+bun dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+
+This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.

week-05/dev/frontend/app/components/BalanceCard.tsx

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+'use client';
+
+import { useAccount, useBalance } from "wagmi";
+
+export function BalanceCard() {
+  const { address, isConnected } = useAccount();
+  const { data: balance } = useBalance({ address });
+
+  return (
+    <div className="rounded-2xl border border-zinc-200 bg-white p-6 shadow-sm dark:border-zinc-800 dark:bg-zinc-900">
+      <p className="text-sm text-zinc-500 dark:text-zinc-400">내 잔액</p>
+      <p className="mt-1 text-3xl font-bold text-zinc-900 dark:text-zinc-100">
+        {isConnected && balance
+          ? `${parseFloat(balance.formatted).toFixed(4)} ${balance.symbol}`
+          : "— ETH"}
+      </p>
+      <p className="mt-1 text-sm text-zinc-400 dark:text-zinc-500">
+        {isConnected && address ? address : "지갑을 연결해주세요"}
+      </p>
+    </div>
+  );
+}

week-05/dev/frontend/app/components/CustomConnectButton.tsx

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+"use client";
+
+import { ConnectButton } from "@rainbow-me/rainbowkit";
+import { useDisconnect } from "wagmi";
+
+export function CustomConnectButton() {
+  const { disconnect } = useDisconnect();
+
+  return (
+    <ConnectButton.Custom>
+      {({ account, chain, openConnectModal, openChainModal, mounted }) => {
+        const connected = mounted && account && chain;
+
+        return (
+          <div className="flex items-center gap-3">
+            {connected ? (
+              <>
+                <button
+                  onClick={openChainModal}
+                  className="rounded-lg bg-zinc-100 px-3 py-2 text-sm font-medium text-zinc-700 transition-colors hover:bg-zinc-200 dark:bg-zinc-800 dark:text-zinc-300 dark:hover:bg-zinc-700"
+                >
+                  {chain.unsupported ? "네트워크 변경 필요" : chain.name}
+                </button>
+
+                <button
+                  onClick={() => {
+                    if (window.confirm("연결을 해제하겠습니까?")) {
+                      disconnect();
+                    }
+                  }}
+                  className="rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-blue-700"
+                >
+                  {account.displayName}
+                </button>
+              </>
+            ) : (
+              <button
+                onClick={openConnectModal}
+                className="rounded-lg bg-blue-600 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-blue-700"
+              >
+                지갑 연결
+              </button>
+            )}
+          </div>
+        );
+      }}
+    </ConnectButton.Custom>
+  );
+}

week-05/dev/frontend/app/components/Footer.tsx

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+export function Footer() {
+  return (
+    <footer className="border-t border-zinc-200 dark:border-zinc-800">
+      <div className="mx-auto max-w-2xl px-6 py-4">
+        <p className="text-center text-xs text-zinc-400">
+          Week 5 — RainbowKit + wagmi
+        </p>
+      </div>
+    </footer>
+  );
+}

week-05/dev/frontend/app/components/Header.tsx

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+import { CustomConnectButton } from "./CustomConnectButton";
+
+export function Header() {
+  return (
+    <header className="sticky top-0 z-10 border-b border-zinc-200 bg-white/80 backdrop-blur dark:border-zinc-800 dark:bg-zinc-900/80">
+      <div className="mx-auto flex max-w-2xl items-center justify-between px-6 py-4">
+        <h1 className="text-lg font-bold text-zinc-900 dark:text-zinc-100">
+          Week 5 dApp
+        </h1>
+        <CustomConnectButton />
+      </div>
+    </header>
+  );
+}

week-05/dev/frontend/app/components/SendEth.tsx

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+'use client';
+
+import { useState } from 'react';
+import { useSendTransaction, useWaitForTransactionReceipt } from 'wagmi';
+import { parseEther } from 'viem';
+
+export function SendEth() {
+  const [to, setTo] = useState('');
+  const [amount, setAmount] = useState('');
+
+  const { sendTransaction, data: hash, isPending } = useSendTransaction();
+
+  const { isLoading: isConfirming, isSuccess } = useWaitForTransactionReceipt({ hash });
+
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    sendTransaction({ to: to as `0x${string}`, value: parseEther(amount) });
+  };
+
+  return (
+    <div className="w-full rounded-2xl border border-zinc-200 bg-white p-6 shadow-sm dark:border-zinc-800 dark:bg-zinc-900">
+      <h2 className="mb-4 text-lg font-semibold text-zinc-900 dark:text-zinc-100">
+        ETH 전송
+      </h2>
+
+      <form onSubmit={handleSubmit} className="flex flex-col gap-4">
+        {/* 받는 주소 */}
+        <div>
+          <label
+            htmlFor="to"
+            className="mb-1 block text-sm font-medium text-zinc-700 dark:text-zinc-300"
+          >
+            받는 주소
+          </label>
+          <input
+            id="to"
+            type="text"
+            placeholder="0x..."
+            value={to}
+            onChange={(e) => setTo(e.target.value)}
+            className="w-full rounded-lg border border-zinc-300 bg-zinc-50 px-4 py-2.5 text-sm text-zinc-900 placeholder-zinc-400 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500 dark:border-zinc-700 dark:bg-zinc-800 dark:text-zinc-100 dark:placeholder-zinc-500"
+          />
+        </div>
+
+        {/* 금액 */}
+        <div>
+          <label
+            htmlFor="amount"
+            className="mb-1 block text-sm font-medium text-zinc-700 dark:text-zinc-300"
+          >
+            금액 (ETH)
+          </label>
+          <input
+            id="amount"
+            type="text"
+            placeholder="0.01"
+            value={amount}
+            onChange={(e) => setAmount(e.target.value)}
+            className="w-full rounded-lg border border-zinc-300 bg-zinc-50 px-4 py-2.5 text-sm text-zinc-900 placeholder-zinc-400 focus:border-blue-500 focus:outline-none focus:ring-1 focus:ring-blue-500 dark:border-zinc-700 dark:bg-zinc-800 dark:text-zinc-100 dark:placeholder-zinc-500"
+          />
+        </div>
+
+        {/* 전송 버튼 */}
+        <button
+          type="submit"
+          disabled={!to || !amount || isPending}
+          className="mt-2 rounded-lg bg-blue-600 px-4 py-2.5 text-sm font-medium text-white transition-colors hover:bg-blue-700 disabled:cursor-not-allowed disabled:bg-zinc-300 disabled:text-zinc-500 dark:disabled:bg-zinc-700 dark:disabled:text-zinc-500"
+        >
+          {isPending ? '전송 중...' : '전송'}
+        </button>
+      </form>
+
+      {/* 트랜잭션 상태 표시 */}
+      <div className="mt-4 space-y-2">
+        {hash && (
+          <div className="rounded-lg bg-zinc-50 p-3 dark:bg-zinc-800">
+            <p className="text-xs text-zinc-500">트랜잭션 해시</p>
+            <p className="mt-1 break-all font-mono text-xs text-zinc-700 dark:text-zinc-300">
+              {hash}
+            </p>
+          </div>
+        )}
+
+        {isConfirming && (
+          <div className="flex items-center gap-2 rounded-lg bg-yellow-50 p-3 text-sm text-yellow-700 dark:bg-yellow-900/20 dark:text-yellow-400">
+            트랜잭션 확인 중...
+          </div>
+        )}
+
+        {isSuccess && (
+          <div className="flex items-center gap-2 rounded-lg bg-green-50 p-3 text-sm text-green-700 dark:bg-green-900/20 dark:text-green-400">
+            트랜잭션 완료!
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

week-05/dev/frontend/app/globals.css

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+@import "tailwindcss";
+
+:root {
+  --background: #ffffff;
+  --foreground: #171717;
+}
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --font-sans: var(--font-geist-sans);
+  --font-mono: var(--font-geist-mono);
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --background: #0a0a0a;
+    --foreground: #ededed;
+  }
+}
+
+body {
+  background: var(--background);
+  color: var(--foreground);
+  font-family: Arial, Helvetica, sans-serif;
+}

week-05/dev/frontend/app/layout.tsx

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+import type { Metadata } from "next";
+import { Geist, Geist_Mono } from "next/font/google";
+import { Providers } from "./providers";
+import "./globals.css";
+
+const geistSans = Geist({
+  variable: "--font-geist-sans",
+  subsets: ["latin"],
+});
+
+const geistMono = Geist_Mono({
+  variable: "--font-geist-mono",
+  subsets: ["latin"],
+});
+
+export const metadata: Metadata = {
+  title: "Week 5 dApp",
+  description: "RainbowKit 지갑 연결 실습",
+};
+
+export default function RootLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <html lang="en">
+      <body
+        className={`${geistSans.variable} ${geistMono.variable} antialiased`}
+      >
+        <Providers>{children}</Providers>
+      </body>
+    </html>
+  );
+}

week-05/dev/frontend/app/page.tsx

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+"use client";
+
+import Image from "next/image";
+import { Header } from "./components/Header";
+import { BalanceCard } from "./components/BalanceCard";
+import { SendEth } from "./components/SendEth";
+import { Footer } from "./components/Footer";
+
+export default function Home() {
+  return (
+    <div className="flex min-h-screen flex-col bg-zinc-50 font-sans dark:bg-zinc-950">
+      <Header />
+      <div className="flex justify-center">
+        <Image src="/Pelican.png" alt="Pelican" width={300} height={300} />
+      </div>
+      <main className="mx-auto flex w-full max-w-2xl flex-1 flex-col gap-6 px-6 py-8">
+        <BalanceCard />
+        <SendEth />
+      </main>
+      <Footer />
+    </div>
+  );
+}

week-05/dev/frontend/app/providers.tsx

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+"use client";
+
+import { useState, useEffect } from "react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { WagmiProvider } from "wagmi";
+import { RainbowKitProvider } from "@rainbow-me/rainbowkit";
+import { config } from "@/config/wagmi";
+import "@rainbow-me/rainbowkit/styles.css";
+
+const queryClient = new QueryClient();
+
+export function Providers({ children }: { children: React.ReactNode }) {
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => {
+    // eslint-disable-next-line react-hooks/set-state-in-effect
+    setMounted(true);
+  }, []);
+
+  if (!mounted) return null;
+
+  return (
+    <WagmiProvider config={config}>
+      <QueryClientProvider client={queryClient}>
+        <RainbowKitProvider>{children}</RainbowKitProvider>
+      </QueryClientProvider>
+    </WagmiProvider>
+  );
+}