chore(ui): drop nav logo + revert hero to default-muted

- Navigation: removed top-left <Logo />, NavLinks now sit at the
  left edge. Logo component itself kept (still used by Footer /
  LoginForm / LoginModal).
- HeroBanner: restored simple "default muted + autoplay" behavior.
  The earlier try-unmuted-fallback flow was working but produced
  unpredictable first-paint audio depending on browser autoplay
  policy; muted is the safer default.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/components/HeroBanner.tsx

@@ -28,24 +28,13 @@ export default function HeroBanner({
   className,
 }: HeroBannerProps) {
   const videoRef = useRef<HTMLVideoElement>(null);
-  // 默认目标:带音播放。但浏览器对"带声音自动播放"有严格限制 ——
-  // 只有当用户与本站已有交互历史(autoplay policy "high engagement")时才允许。
-  // 真实初始状态由下面的 effect 试播后写回:成功 → false,被拦截 → true。
-  const [isMuted, setIsMuted] = useState(false);
+  const [isMuted, setIsMuted] = useState(true);
 
   useEffect(() => {
     const v = videoRef.current;
     if (!v || !videoSrc) return;
-    // 先尝试带音播放,失败立刻 fallback 静音播放(并把声音按钮置为静音态)。
-    // 几乎所有首次访问场景都会走到 fallback,用户点声音按钮再解除静音。
-    v.muted = false;
-    v.play()
-      .then(() => setIsMuted(false))
-      .catch(() => {
-        v.muted = true;
-        setIsMuted(true);
-        v.play().catch(() => {});
-      });
+    v.muted = isMuted;
+    v.play().catch(() => {});
     // 仅在 videoSrc 变化时执行 · 不依赖 isMuted(mute 切换由按钮处理)
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [videoSrc]);

src/components/Navigation.tsx

@@ -2,7 +2,6 @@
 
 import { useEffect, useState } from "react";
 import { usePathname } from "next/navigation";
-import Logo from "./Logo";
 import NavLinks from "./NavLinks";
 import SearchTrigger from "./SearchTrigger";
 import AuthMenu from "./auth/AuthMenu";
@@ -82,9 +81,7 @@ export default function Navigation() {
         )}
       />
       <nav className="relative max-w-[1500px] mx-auto h-20 px-4 sm:px-6 lg:px-8 flex items-center gap-8">
-        <Logo size="md" />
-
-        {/* 中部:首页 / 排行榜 / 我的 */}
+        {/* 左侧:首页 / 排行榜 / 我的(logo 已移除) */}
         <NavLinks className="hidden md:flex" />
 
         {/* 右侧:搜索 + 今日余票 + 登录/注册 (或 头像+下拉) */}