feat: use Guanghu light logo in desktop chrome

src/App.css

@@ -13,7 +13,7 @@
 .hololake-bar__brand, .hololake-bar__library { border: 0; background: transparent; color: inherit; cursor: pointer; }
 .hololake-bar__brand { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 650; letter-spacing: .02em; }
 .hololake-bar__brand b { color: var(--accent-blue); font-weight: 600; }
-.hololake-bar__mark { display: grid; place-items: center; width: 20px; height: 20px; color: var(--accent-blue); border: 1px solid var(--border-strong); border-radius: 50%; }
+.hololake-bar__mark { display: block; width: 24px; height: 28px; object-fit: contain; object-position: center; flex: 0 0 24px; }
 .hololake-bar__line { width: 1px; height: 16px; background: var(--border-default); }
 .hololake-bar__context { color: var(--text-secondary); font-size: 12px; }
 .hololake-bar__library { margin-left: auto; padding: 5px 9px; border: 1px solid var(--border-default); border-radius: 6px; color: var(--text-secondary); font-size: 12px; }

src/App.tsx

@@ -23,6 +23,7 @@ import { NoteRetargetingDialogs } from './components/note-retargeting/NoteRetarg
 import { StartupScreen } from './components/StartupScreen'
 import { HoloLakeHome } from './components/HoloLakeHome'
 import { GUANGHU_THEME_LABELS } from './lib/guanghuTheme'
+import guanghuLogoLight from './assets/guanghu-logo-light.png'
 import { useAiAgentsOnboarding } from './hooks/useAiAgentsOnboarding'
 import { useAiAgentsStatus } from './hooks/useAiAgentsStatus'
 import { useVaultAiGuidanceStatus } from './hooks/useVaultAiGuidanceStatus'
@@ -1627,7 +1628,7 @@ function MainApp({ noteWindowParams }: { noteWindowParams: NoteWindowParams | nu
     <AppPreferencesProvider dateDisplayFormat={dateDisplayFormat}>
       <div className="app-shell">
         <header className="hololake-bar">
-          <button className="hololake-bar__brand" onClick={() => setShowHoloLakeHome(true)}><span className="hololake-bar__mark">✦</span><span>HoloLake <b>Era</b></span></button>
+          <button className="hololake-bar__brand" onClick={() => setShowHoloLakeHome(true)}><img className="hololake-bar__mark" src={guanghuLogoLight} alt="光湖" /><span>HoloLake <b>Era</b></span></button>
           <span className="hololake-bar__line" />
           <span className="hololake-bar__context">光湖语言人格驱动操作系统</span>
           <button className="hololake-bar__library" onClick={() => setShowHoloLakeHome(false)}>知识库</button>