feat: 导航菜单改为 hover 触发

为所有导航菜单组件添加 trigger="hover" 属性，使菜单在鼠标悬停时自动展开，提升用户体验。

修改的组件：
- DesktopNav.js: 4 个主导航菜单（高频跟踪、行情复盘、AGENT社群、联系我们）
- MoreMenu.js: 平板版"更多"下拉菜单
- PersonalCenterMenu.js: 个人中心下拉菜单

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/components/Navbars/components/Navigation/DesktopNav.js

@@ -46,7 +46,7 @@ const DesktopNav = memo(({ isAuthenticated, user }) => {
     return (
         <HStack spacing={8}>
             {/* 高频跟踪 */}
-            <Menu>
+            <Menu trigger="hover">
                 <MenuButton
                     as={Button}
                     variant="ghost"
@@ -102,7 +102,7 @@ const DesktopNav = memo(({ isAuthenticated, user }) => {
             </Menu>
 
             {/* 行情复盘 */}
-            <Menu>
+            <Menu trigger="hover">
                 <MenuButton
                     as={Button}
                     variant="ghost"
@@ -160,7 +160,7 @@ const DesktopNav = memo(({ isAuthenticated, user }) => {
             </Menu>
 
             {/* AGENT社群 */}
-            <Menu>
+            <Menu trigger="hover">
                 <MenuButton as={Button} variant="ghost" rightIcon={<ChevronDownIcon />}>
                     AGENT社群
                 </MenuButton>
@@ -183,7 +183,7 @@ const DesktopNav = memo(({ isAuthenticated, user }) => {
             </Menu>
 
             {/* 联系我们 */}
-            <Menu>
+            <Menu trigger="hover">
                 <MenuButton as={Button} variant="ghost" rightIcon={<ChevronDownIcon />}>
                     联系我们
                 </MenuButton>

src/components/Navbars/components/Navigation/MoreMenu.js

@@ -37,7 +37,7 @@ const MoreMenu = memo(({ isAuthenticated, user }) => {
     if (!isAuthenticated || !user) return null;
 
     return (
-        <Menu>
+        <Menu trigger="hover">
             <MenuButton
                 as={Button}
                 variant="ghost"

src/components/Navbars/components/Navigation/PersonalCenterMenu.js

@@ -41,7 +41,7 @@ const PersonalCenterMenu = memo(({ user, handleLogout }) => {
     };
 
     return (
-        <Menu>
+        <Menu trigger="hover">
             <MenuButton
                 as={Button}
                 size="sm"