Implementar modo oscuro con toggle en sidebar

src/App.tsx

@@ -12,8 +12,9 @@ import { NuevoIngreso } from '@/sections/NuevoIngreso';
 import { EditIngreso } from '@/sections/EditIngreso';
 import { Spinner } from '@/components/ui/spinner';
 import { Button } from '@/components/ui/button';
+import { ThemeProvider } from '@/contexts/ThemeContext';
 
-function App() {
+function AppContent() {
   const store = useHospitalStore();
 
   if (!store.isLoaded) {
@@ -207,4 +208,12 @@ case 'nuevoingreso':
   );
 }
 
+function App() {
+  return (
+    <ThemeProvider>
+      <AppContent />
+    </ThemeProvider>
+  );
+}
+
 export default App;