feat: initialize dashboard structure with auth, feed management, and activity feed filtering components

src/App.tsx

@@ -1,5 +1,6 @@
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
 import { ThemeProvider, createTheme } from '@mui/material/styles';
+import CssBaseline from '@mui/material/CssBaseline';
 import { MainLayout } from './components/layout/MainLayout';
 import { ProtectedRoute } from './components/ProtectedRoute';
 
@@ -46,6 +47,7 @@ import { AuditSession } from './pages/audit-session/AuditSession';
 export default function App() {
   return (
     <ThemeProvider theme={theme}>
+      <CssBaseline />
       <BrowserRouter>
         <Routes>
           {/* Public Routes */}