Stop per-request module re-imports leaking memory in production

Page rendering imported the SSR bundle and .server.ts modules with a
unique ?t= query on every request, in production too. Each one became a
new, never-evicted module record (and re-ran module top-level code), so
RSS grew with request count. Cache-bust only in dev via importFresh.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/utils/import-fresh.js

@@ -0,0 +1,10 @@
+import isDevelopment from "./is-development";
+/**
+ * Dev: bypass Bun's module registry so rebuilt files are picked up.
+ * Prod: import by stable path so each module is loaded (and kept) once.
+ * A unique `?t=` per call creates a new, never-evicted module record, so
+ * using it in production leaks memory on every request.
+ */
+export default function importFresh(file_path) {
+    return import(isDevelopment() ? `${file_path}?t=${Date.now()}` : file_path);
+}