Add support for dark mode

pages/_app.tsx

@@ -4,9 +4,14 @@ import "@blueprintjs/core/lib/css/blueprint.css";
 import "@blueprintjs/icons/lib/css/blueprint-icons.css";
 import "react-mosaic-component/react-mosaic-component.css";
 import type { AppProps } from "next/app";
+import { DarkModeProvider } from "../ui/providers/dark-mode-provider";
 
 function MyApp({ Component, pageProps }: AppProps) {
-  return <Component {...pageProps} />;
+  return (
+    <DarkModeProvider>
+      <Component {...pageProps} />
+    </DarkModeProvider>
+  );
 }
 
 export default MyApp;