Refactor Nostr Client and Update Dependencies

- Replaced NDKPrivateKeySigner with PrivateKeySigner from applesauce-signers for improved signing functionality.
- Updated the Nostr client implementation to utilize nostr-tools for event management and connection pooling.
- Enhanced event fetching logic to support multiple versions of replaceable events based on limit parameters.
- Updated package dependencies in package.json and bun.lock, including the addition of applesauce-core and applesauce-signers.
- Refined event kind definitions and improved documentation for clarity and consistency with NIP specifications.
- Adjusted CSS styles in bundle.css for better visual consistency across components.

app/web/package.json

@@ -20,7 +20,9 @@
     "svelte": "^3.55.0"
   },
   "dependencies": {
-    "@nostr-dev-kit/ndk": "^2.17.3",
+    "applesauce-core": "^4.1.0",
+    "applesauce-signers": "^4.1.0",
+    "nostr-tools": "^2.17.0",
     "sirv-cli": "^2.0.0"
   }
 }