Add files

src/renderer/router/titlebar-outlet.tsx

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+import { Outlet } from 'react-router';
+import styled from 'styled-components';
+import { Titlebar } from '/@/renderer/features/titlebar/components/titlebar';
+
+const TitlebarContainer = styled.header`
+  position: absolute;
+  top: 0;
+  right: 0;
+  z-index: 5000;
+  height: 2.5rem;
+  background: var(--titlebar-bg);
+  -webkit-app-region: drag;
+  opacity: 0.85;
+`;
+
+export const TitlebarOutlet = () => {
+  return (
+    <>
+      <TitlebarContainer>
+        <Titlebar />
+      </TitlebarContainer>
+      <Outlet />
+    </>
+  );
+};