merge: resolve compare-view conflicts with dark mode changes

Combines GitCompareArrows icon import with Sun/Moon and ThemeContext imports.

frontend/src/App.tsx

@@ -1,6 +1,7 @@
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { AuthProvider } from './context/AuthContext';
+import { ThemeProvider } from './context/ThemeContext';
 import { Layout } from './components/Layout';
 import { ProtectedRoute } from './components/ProtectedRoute';
 import { Login } from './pages/Login';
@@ -23,6 +24,7 @@ const queryClient = new QueryClient({
 
 function App() {
   return (
+    <ThemeProvider>
     <QueryClientProvider client={queryClient}>
       <AuthProvider>
         <BrowserRouter>
@@ -63,6 +65,7 @@ function App() {
         </BrowserRouter>
       </AuthProvider>
     </QueryClientProvider>
+    </ThemeProvider>
   );
 }