feat: add TypeScript definitions for next-auth session with accessToken and user details

_archive/frontend/lib/use-auth-fetch.ts

@@ -0,0 +1,32 @@
+'use client';
+
+import { useSession } from 'next-auth/react';
+import { useCallback } from 'react';
+
+/**
+ * Hook som returnerar en fetch-funktion med Authorization-header automatiskt ifylld.
+ * Används i klientkomponenter som gör anrop till endpoints som Caddy routar direkt
+ * till NestJS (t.ex. /api/recipes*, /api/products*, /api/inventory*).
+ *
+ * Exempel:
+ *   const authFetch = useAuthFetch();
+ *   const res = await authFetch('/api/recipes/1', { method: 'PATCH', body: JSON.stringify(data) });
+ */
+export function useAuthFetch() {
+  const sessionResult = useSession();
+  const accessToken = sessionResult?.data?.accessToken ?? '';
+
+  return useCallback(
+    (url: string, init: RequestInit = {}): Promise<Response> => {
+      const headers = new Headers(init.headers);
+      if (accessToken) {
+        headers.set('Authorization', `Bearer ${accessToken}`);
+      }
+      if (!headers.has('Content-Type') && init.body && typeof init.body === 'string') {
+        headers.set('Content-Type', 'application/json');
+      }
+      return fetch(url, { ...init, headers });
+    },
+    [accessToken],
+  );
+}