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

server/lib/http.ts

@@ -0,0 +1,28 @@
+import type { H3Event } from "h3";
+import { setResponseStatus } from "h3";
+
+/**
+ * Map a thrown h3 error to the API's legacy JSON contract
+ * (`{ error: string }` with the proper status code).
+ */
+export function toApiError(event: H3Event, err: unknown): { error: string } {
+  const e = err as { statusCode?: number; statusMessage?: string; message?: string };
+  setResponseStatus(event, e.statusCode ?? 500);
+  return { error: e.statusMessage ?? e.message ?? "Internal Server Error" };
+}
+
+/**
+ * Wrap an API handler so thrown h3 errors (401/403/400/...) become
+ * `{ error }` JSON responses instead of the default HTML error page.
+ */
+export function wrapApi<Args extends unknown[]>(
+  fn: (event: H3Event, ...args: Args) => Promise<unknown>,
+): (event: H3Event, ...args: Args) => Promise<unknown> {
+  return async (event, ...args) => {
+    try {
+      return await fn(event, ...args);
+    } catch (err) {
+      return toApiError(event, err);
+    }
+  };
+}