feat: align homepage with youtube layout

src/layouts/AppShell.jsx

@@ -1,12 +1,64 @@
 // Author: fruit.com.cn
 import { Bell, Bookmark, Compass, History, Home, Menu, Search, UserRound, X } from 'lucide-react';
+import { useState } from 'react';
 import { NavLink, Outlet, useNavigate } from 'react-router-dom';
 import { useAppStore } from '../app/store';
 import { LanguageSwitcher } from '../components/LanguageSwitcher';
 
 export function AppShell() {
-  const { locale, lang, setLang, query, setQuery, sidebarOpen, setSidebarOpen } = useAppStore(); const navigate = useNavigate();
+  const { locale, query, setQuery, sidebarOpen, setSidebarOpen } = useAppStore();
+  const navigate = useNavigate();
+  const [searchOpen, setSearchOpen] = useState(false);
   const navItems = [[Home, locale.home, '/'], [Compass, locale.shorts, '/shorts'], [UserRound, locale.subscriptions, '/subscriptions'], [Bookmark, locale.library, '/library'], [History, locale.history, '/history']];
-  const submitSearch = (event) => { event.preventDefault(); navigate(`/search?q=${encodeURIComponent(query)}`); };
-  return <><header className="topbar"><button className="mobile-only icon-button" onClick={() => setSidebarOpen(!sidebarOpen)} aria-label="Menu"><Menu /></button><NavLink className="brand" to="/"><img src="/brand/ymb-logo-blue.png" alt="YMB" /></NavLink><form className="search-form" onSubmit={submitSearch}><input value={query} onChange={(event) => setQuery(event.target.value)} placeholder={locale.search} aria-label={locale.search} /><button aria-label="Search"><Search size={19} /></button></form><div className="top-actions"><LanguageSwitcher /><Bell size={19} /><span className="profile-chip">N</span></div></header><aside className={`sidebar ${sidebarOpen ? 'open' : ''}`}><nav>{navItems.map(([Icon, label, to]) => <NavLink to={to} end={to === '/'} key={to}><Icon size={19} />{label}</NavLink>)}</nav><div className="nav-rule" /><small>GENRE POPULER</small>{locale.genres.slice(1).map((genre) => <button className="genre-link" key={genre} onClick={() => navigate(`/search?genre=${encodeURIComponent(genre)}`)}>{genre}</button>)}</aside><main className="content"><Outlet /></main><nav className="bottom-nav">{navItems.slice(0, 4).map(([Icon, label, to]) => <NavLink to={to} key={to}><Icon size={19} />{label}</NavLink>)}</nav>{sidebarOpen && <button className="scrim mobile-only" onClick={() => setSidebarOpen(false)} aria-label="Close"><X /></button>}</>;
+  const submitSearch = (event) => {
+    event.preventDefault();
+    navigate(`/search?q=${encodeURIComponent(query)}`);
+  };
+
+  return (
+    <>
+      <header className="topbar">
+        <button className="icon-button topbar-menu" onClick={() => setSidebarOpen(!sidebarOpen)} aria-label="Menu" type="button">
+          <Menu size={22} />
+        </button>
+        <NavLink className="brand" to="/" aria-label="YMB">
+          <img src="/brand/ymb-logo-blue.png" alt="YMB" />
+        </NavLink>
+        <form className={`search-form ${searchOpen ? 'open' : ''}`} onSubmit={submitSearch}>
+          <input value={query} onChange={(event) => setQuery(event.target.value)} placeholder={locale.search} aria-label={locale.search} />
+          <button aria-label="Search" type="submit"><Search size={19} /></button>
+        </form>
+        <div className="top-actions">
+          <button className="icon-button mobile-search" onClick={() => setSearchOpen(!searchOpen)} aria-label={locale.search} type="button"><Search size={20} /></button>
+          <LanguageSwitcher />
+          <Bell size={19} aria-hidden="true" />
+          <span className="profile-chip" aria-label="Profile">N</span>
+        </div>
+      </header>
+
+      <aside className={`sidebar ${sidebarOpen ? 'open' : 'closed'}`}>
+        <nav>
+          {navItems.map(([Icon, label, to]) => (
+            <NavLink to={to} end={to === '/'} key={to}>
+              <Icon size={19} />
+              <span className="sidebar-label">{label}</span>
+            </NavLink>
+          ))}
+        </nav>
+        <div className="nav-rule" />
+        <small>GENRE POPULER</small>
+        {locale.genres.slice(1).map((genre) => (
+          <button className="genre-link" key={genre} onClick={() => navigate(`/search?genre=${encodeURIComponent(genre)}`)} type="button">
+            <span className="sidebar-label">{genre}</span>
+          </button>
+        ))}
+      </aside>
+
+      <main className={`content ${sidebarOpen ? '' : 'content-wide'}`}><Outlet /></main>
+      <nav className="bottom-nav">
+        {navItems.slice(0, 4).map(([Icon, label, to]) => <NavLink to={to} key={to}><Icon size={19} />{label}</NavLink>)}
+      </nav>
+      {sidebarOpen && <button className="scrim mobile-only" onClick={() => setSidebarOpen(false)} aria-label="Close" type="button"><X /></button>}
+    </>
+  );
 }