add login/sign-up page with dark/light mode

node_modules/next/dist/server/lib/cache-handlers/default.d.ts

@@ -0,0 +1,10 @@
+/**
+ * This is the default "use cache" handler it defaults to an in-memory store.
+ * In-memory caches are fragile and should not use stale-while-revalidate
+ * semantics on the caches because it's not worth warming up an entry that's
+ * likely going to get evicted before we get to use it anyway. However, we also
+ * don't want to reuse a stale entry for too long so stale entries should be
+ * considered expired/missing in such cache handlers.
+ */
+import type { CacheHandler } from './types';
+export declare function createDefaultCacheHandler(maxSize: number): CacheHandler;