feat: initialize markr nostr bookmark client

- Add project structure with TypeScript, React, and Vite
- Implement nostr authentication using browser extension (NIP-07)
- Add NIP-51 compliant bookmark fetching and display
- Create minimal UI with login and bookmark components
- Integrate applesauce-core and applesauce-react libraries
- Add responsive styling with dark/light mode support
- Include comprehensive README with setup instructions

This is a minimal MVP for a nostr bookmark client that allows users to
view their bookmarks according to NIP-51 specification.

node_modules/applesauce-react/dist/hooks/use-event-model.js

@@ -0,0 +1,15 @@
+import { withImmediateValueOrDefault } from "applesauce-core";
+import hash_sum from "hash-sum";
+import { of } from "rxjs";
+import { useEventStore } from "./use-event-store.js";
+import { useObservableEagerMemo } from "./use-observable-memo.js";
+/** Runs and subscribes to a model on the event store */
+export function useEventModel(factory, args) {
+    const store = useEventStore();
+    return useObservableEagerMemo(() => {
+        if (args)
+            return store.model(factory, ...args).pipe(withImmediateValueOrDefault(undefined));
+        else
+            return of(undefined);
+    }, [hash_sum(args), store, factory]);
+}