헤더: 코드로 참여 입력칸 빼고 테마 버튼(🌙/☀️) 추가 — 누르면 밝게↔어둡게

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/components/SiteHeader.tsx

@@ -1,28 +1,12 @@
-/** PC top menu with an always-available room-code box (docs/07-ui-ux.md §3.2). */
+/** PC top menu (docs/07-ui-ux.md §3.2): 로고·메뉴, 오른쪽에 테마 버튼과 로그인/계정 메뉴. */
 import { useEffect, useRef, useState } from 'react';
 import { Link, NavLink, useNavigate } from 'react-router';
-import { normalizeRoomCode } from '@bg/shared/lite';
 import { api } from '../net/api';
 import { useSession } from '../store/session';
-import { toast } from '../store/toast';
 import { Avatar, ConfirmSheet } from './ui';
 
 export function SiteHeader() {
   const { me, siteName, role } = useSession();
-  const [code, setCode] = useState('');
-  const nav = useNavigate();
-  const join = async (e: React.FormEvent) => {
-    e.preventDefault();
-    const c = normalizeRoomCode(code);
-    if (!c) return toast('방 코드 6자리를 넣어 주세요.', 'error');
-    try {
-      await api.room(c);
-      setCode('');
-      nav(`/r/${c}`);
-    } catch (ex) {
-      toast((ex as Error).message, 'error');
-    }
-  };
   return (
     <header className="site-header">
       <div className="site-header-inner">
@@ -37,10 +21,7 @@ export function SiteHeader() {
           <NavLink to="/games">게임 목록</NavLink>
           {role !== 'user' && <NavLink to="/admin">관리자</NavLink>}
         </nav>
-        <form className="header-join" onSubmit={join} aria-label="코드로 참여">
-          <input value={code} onChange={(e) => setCode(e.target.value)} placeholder="방 코드 6자리" inputMode="numeric" maxLength={40} aria-label="방 코드" />
-          <button className="btn btn-primary btn-sm">참여</button>
-        </form>
+        <ThemeToggle />
         {me ? (
           <AccountMenu />
         ) : (
@@ -53,6 +34,28 @@ export function SiteHeader() {
   );
 }
 
+const darkQuery = () => matchMedia('(prefers-color-scheme: dark)');
+
+/** 누를 때마다 밝게 ↔ 어둡게. '자동'이면 지금 보이는 색의 반대로 바꿔요. 설정 페이지의 '화면 색'과 같은 값이에요. */
+function ThemeToggle() {
+  const theme = useSession((s) => s.settings.theme);
+  const updateSettings = useSession((s) => s.updateSettings);
+  const [systemDark, setSystemDark] = useState(() => darkQuery().matches);
+  useEffect(() => {
+    const q = darkQuery();
+    const on = () => setSystemDark(q.matches);
+    q.addEventListener('change', on);
+    return () => q.removeEventListener('change', on);
+  }, []);
+  const dark = theme === 'dark' || (theme === 'auto' && systemDark);
+  const label = dark ? '밝은 화면으로 바꾸기' : '어두운 화면으로 바꾸기';
+  return (
+    <button type="button" className="theme-toggle" aria-label={label} title={label} onClick={() => updateSettings({ theme: dark ? 'light' : 'dark' })}>
+      <span aria-hidden>{dark ? '☀️' : '🌙'}</span>
+    </button>
+  );
+}
+
 /** 로그인한 뒤: 닉네임(디스코드 연결 시 디스코드 이름) → 누르면 [설정] [로그아웃] 메뉴. */
 function AccountMenu() {
   const me = useSession((s) => s.me)!;

apps/web/src/styles/global.css

@@ -589,29 +589,23 @@ label.field {
   color: var(--primary);
   background: var(--primary-soft);
 }
-.header-join {
-  display: flex;
-  gap: 6px;
+.theme-toggle {
   margin-left: auto;
-}
-.header-join input {
-  width: 150px;
+  width: 42px;
   height: 42px;
-  border-radius: 10px;
+  flex: none;
   border: 2px solid var(--border);
-  background: var(--bg);
-  padding: 0 12px;
-  font-size: 1.05rem;
-  font-weight: 700;
-  letter-spacing: 0.08em;
-  font-variant-numeric: tabular-nums;
+  border-radius: 999px;
+  background: transparent;
+  font-size: 1.2rem;
+  line-height: 1;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
 }
-.header-join input:focus {
-  outline: none;
-  border-color: var(--primary);
-}
-.header-join .btn {
-  min-height: 42px;
+.theme-toggle:hover {
+  background: var(--surface-2);
 }
 .header-user {
   display: flex;
@@ -693,9 +687,6 @@ button.header-user {
     padding: 0 12px;
     gap: 8px;
   }
-  .header-join {
-    display: none;
-  }
   .site-logo .full {
     display: none;
   }