The first commit, the core and all files is adding to repo

app/auth/callback/route.ts

@@ -0,0 +1,12 @@
+import { NextRequest, NextResponse } from "next/server";
+import { authClient } from "@/lib/supabase";
+export async function GET(request: NextRequest) {
+  const code = request.nextUrl.searchParams.get("code");
+  if (code) {
+    const client = await authClient();
+    const { error } = await client.auth.exchangeCodeForSession(code);
+    if (!error)
+      return NextResponse.redirect(new URL("/dashboard", request.url));
+  }
+  return NextResponse.redirect(new URL("/dashboard?auth=failed", request.url));
+}