feat: 新增主页（Home）和通用导航（Navigation）组件。

src/components/common/Navigation/Navigation.tsx

@@ -75,12 +75,14 @@ const navItems: NavItem[] = [
     label: '汇率',
     ariaLabel: '汇率管理 - 管理货币汇率',
   },
+  /*
   {
     path: '/ledgers/manage',
     icon: 'solar:notebook-bold-duotone',
     label: '账本',
     ariaLabel: '账本管理 - 切换和管理账本',
   },
+  */
   {
     path: '/settings',
     icon: 'solar:settings-bold-duotone',

src/pages/Home/Home.tsx

@@ -279,10 +279,9 @@ function Home() {
       <header className="home-header">
         <div className="home-greeting">
           <div style={{ display: 'flex', alignItems: 'center', gap: '0.75rem', marginBottom: '0.25rem' }}>
-            <div className="greeting-pill" onClick={() => setLedgerSelectorOpen(true)} style={{ display: 'inline-flex', alignItems: 'center', gap: '6px', background: 'rgba(255,255,255,0.4)', padding: '4px 10px', borderRadius: '20px', fontSize: '0.8rem', cursor: 'pointer', border: '1px solid rgba(255,255,255,0.5)' }}>
+            <div className="greeting-pill" style={{ display: 'inline-flex', alignItems: 'center', gap: '6px', background: 'rgba(255,255,255,0.4)', padding: '4px 10px', borderRadius: '20px', fontSize: '0.8rem', border: '1px solid rgba(255,255,255,0.5)' }}>
               <Icon icon="solar:notebook-minimalistic-bold-duotone" width="14" />
               <span style={{ fontWeight: 600 }}>{currentLedger?.name || '默认账本'}</span>
-              <Icon icon="solar:alt-arrow-down-bold" width="10" />
             </div>
             <span className="home-date">{new Date().toLocaleDateString('zh-CN', { weekday: 'short', month: 'long', day: 'numeric' })}</span>
           </div>