feat: 게임 시작/다운로드 버튼 통합

- 단일 "게임 시작" 버튼으로 통합
- 런처 설치 시 게임 실행, 미설치 시 자동 다운로드 (blur 감지)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/DownloadSection.css

@@ -19,45 +19,29 @@
   margin: 0 0 28px;
 }
 
-.btn-download {
+.btn-play {
   display: inline-block;
-  padding: 16px 48px;
+  padding: 18px 64px;
   background: #BACDB0;
   color: #2E2C2F;
   border: none;
   border-radius: 8px;
-  font-size: 1.1rem;
+  font-size: 1.2rem;
   font-weight: 700;
-  text-decoration: none;
   cursor: pointer;
   transition: opacity 0.2s, transform 0.15s;
   letter-spacing: 0.05em;
 }
 
-.btn-download:hover {
+.btn-play:hover {
   opacity: 0.9;
   transform: translateY(-1px);
 }
 
-.btn-launch {
-  display: inline-block;
-  padding: 16px 48px;
-  background: transparent;
-  color: #BACDB0;
-  border: 2px solid #BACDB0;
-  border-radius: 8px;
-  font-size: 1.1rem;
-  font-weight: 700;
-  cursor: pointer;
-  transition: background 0.2s, color 0.2s, transform 0.15s;
-  letter-spacing: 0.05em;
-  margin-left: 16px;
-}
-
-.btn-launch:hover {
-  background: #BACDB0;
-  color: #2E2C2F;
-  transform: translateY(-1px);
+.btn-play:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+  transform: none;
 }
 
 .launch-hint {

src/components/DownloadSection.jsx

@@ -7,6 +7,7 @@ import './DownloadSection.css';
 export default function DownloadSection() {
   const [info, setInfo] = useState(null);
   const [ready, setReady] = useState(false);
+  const [launching, setLaunching] = useState(false);
   const { user } = useAuth();
   const navigate = useNavigate();
 
@@ -16,19 +17,30 @@ export default function DownloadSection() {
       .catch(() => setReady(true));
   }, []);
 
-  const handleDownload = (e) => {
-    if (!user) {
-      e.preventDefault();
-      navigate('/login');
-    }
-  };
-
-  const handleLaunch = () => {
+  const handlePlay = () => {
     if (!user) {
       navigate('/login');
       return;
     }
+
+    setLaunching(true);
+
+    let launched = false;
+    const onBlur = () => { launched = true; };
+    window.addEventListener('blur', onBlur);
     window.location.href = 'a301://launch?token=' + user.token;
+
+    setTimeout(() => {
+      window.removeEventListener('blur', onBlur);
+      setLaunching(false);
+      if (!launched && info?.url) {
+        // 런처 미설치 → 자동 다운로드
+        const a = document.createElement('a');
+        a.href = info.url;
+        a.download = '';
+        a.click();
+      }
+    }, 2000);
   };
 
   if (!ready) return null;
@@ -36,20 +48,17 @@ export default function DownloadSection() {
   return (
     <section className="download-section">
       <div className="download-content">
-        <h2 className="download-title">게임 런처 다운로드</h2>
+        <h2 className="download-title">A301</h2>
         {info ? (
           <>
             <p className="download-meta">
-              {info.fileName} &middot; {info.fileSize} &middot; {info.version}
+              {info.version} &middot; {info.fileSize}
             </p>
-            <a href={info.url} download onClick={handleDownload} className="btn-download">
-              {user ? '다운로드' : '로그인 후 다운로드'}
-            </a>
-            <button onClick={handleLaunch} className="btn-launch">
-              게임 시작
+            <button onClick={handlePlay} className="btn-play" disabled={launching}>
+              {launching ? '실행 중...' : '게임 시작'}
             </button>
             <p className="launch-hint">
-              게임 시작이 안 되나요? 먼저 다운로드 후 launcher.exe install을 실행해주세요.
+              처음 설치하는 경우 자동으로 다운로드됩니다
             </p>
           </>
         ) : (