implement hashrouter instead of browserrouter, add nextgraphauth logout to logout button

src/App.tsx

@@ -1,4 +1,4 @@
-import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';
+import { HashRouter as Router, Routes, Route } from 'react-router-dom';
 import { ThemeProvider } from '@mui/material/styles';
 import CssBaseline from '@mui/material/CssBaseline';
 import { OnboardingProvider } from '@/contexts/OnboardingContext';

src/components/layout/DashboardLayout.tsx

@@ -1,6 +1,7 @@
 import { useState, useEffect } from 'react';
 import type { ReactNode } from 'react';
 import { useLocation, useNavigate } from 'react-router-dom';
+import { useNextGraphAuth } from '@/lib/nextgraph';
 import {
   Box,
   Drawer,

src/pages/AccountPage.tsx

@@ -1,5 +1,6 @@
 import { useState, useEffect } from 'react';
 import { useSearchParams } from 'react-router-dom';
+import { useNextGraphAuth } from '@/lib/nextgraph';
 import {
   Typography,
   Box,
@@ -59,6 +60,7 @@ const TabPanel = ({ children, value, index }: TabPanelProps) => {
 const AccountPage = () => {
   const theme = useTheme();
   const [searchParams] = useSearchParams();
+  const nextGraphAuth = useNextGraphAuth();
   
   // Initialize tab from URL parameter
   const initialTab = parseInt(searchParams.get('tab') || '0', 10);
@@ -599,9 +601,20 @@ const AccountPage = () => {
         <Button
           variant="outlined"
           startIcon={<Logout />}
-          onClick={() => {
-            // Handle logout
-            console.log('Logout clicked');
+          onClick={async () => {
+            try {
+              console.log('NextGraph Auth object:', nextGraphAuth);
+              console.log('Available methods:', nextGraphAuth ? Object.keys(nextGraphAuth) : 'none');
+              
+              if (nextGraphAuth?.logout && typeof nextGraphAuth.logout === 'function') {
+                console.log('Calling logout...');
+                await nextGraphAuth.logout();
+              } else {
+                console.log('Logout function not available or not a function');
+              }
+            } catch (error) {
+              console.error('Logout failed:', error);
+            }
           }}
           sx={{ 
             color: 'error.main',