feat(tanstack): initialize TanStack project with routing, API, and error handling components

tanstack/src/routes/_pathlessLayout.tsx

@@ -0,0 +1,16 @@
+import { Outlet, createFileRoute } from '@tanstack/react-router'
+
+export const Route = createFileRoute('/_pathlessLayout')({
+  component: LayoutComponent,
+})
+
+function LayoutComponent() {
+  return (
+    <div className="p-2">
+      <div className="border-b">I'm a layout</div>
+      <div>
+        <Outlet />
+      </div>
+    </div>
+  )
+}