feat: migrate to Nuxt 4 (Nitro) and Tailwind CSS v3

server/lib/cf.ts

@@ -0,0 +1,39 @@
+import type { H3Event } from "h3";
+import type { Env } from "./types";
+
+/**
+ * Cloudflare bindings (KV, D1, secrets) from the request context. Works on
+ * Cloudflare Workers (fetch and scheduled) and in tests that stub
+ * `event.context.cloudflare`. Throws with a clear message in other runtimes.
+ */
+export function cfEnv(event: H3Event): Env {
+  const env = (event.context.cloudflare as { env?: Env } | undefined)?.env;
+  if (!env) {
+    throw new Error("Cloudflare bindings unavailable — run via wrangler dev/deploy");
+  }
+  return env;
+}
+
+/** `waitUntil` from the CF execution context (no-op outside workers). */
+export function cfWaitUntil(event: H3Event): (promise: Promise<unknown>) => void {
+  const cloudflare = event.context.cloudflare as
+    | {
+        ctx?: { waitUntil?: (p: Promise<unknown>) => void };
+        context?: { waitUntil?: (p: Promise<unknown>) => void };
+      }
+    | undefined;
+  const waitUntil =
+    (event.context.waitUntil as ((p: Promise<unknown>) => void) | undefined) ??
+    cloudflare?.context?.waitUntil ??
+    cloudflare?.ctx?.waitUntil;
+  return waitUntil ? waitUntil.bind(event.context) : () => undefined;
+}
+
+/** Lowercased request headers (the provider detection reads lowercase keys). */
+export function headersFrom(event: H3Event): Record<string, string> {
+  const out: Record<string, string> = {};
+  event.headers.forEach((value, key) => {
+    out[key.toLowerCase()] = value;
+  });
+  return out;
+}