Disable React Compiler to fix SSR prerender on Linux

The React Compiler (reactCompiler: true) generates code that calls
react/compiler-runtime during SSR, which resolves to null on Linux/bun,
causing "Cannot read properties of null (reading 'useRef')" on every
statically prerendered page. Disabling restores normal SWC transforms.

https://claude.ai/code/session_014126WHVRT8mftmqkU6dajG

next.config.js

@@ -7,7 +7,7 @@ import "./src/env.js";
 /** @type {import("next").NextConfig} */
 const config = {
   output: "standalone",
-  reactCompiler: true,
+  reactCompiler: false,
   serverExternalPackages: ["pg", "better-auth"],
 };