refactor: migrate to applesauce-accounts for proper account management

- Replace manual WebSocket connections with applesauce-accounts
- Use ExtensionAccount.fromExtension() for nostr browser extension integration
- Add AccountsProvider to component tree for account management
- Use useActiveAccount hook to get current user account
- Simplify user display to show formatted public key (profile fetching TODO)
- Remove manual profile fetching WebSocket code
- Improve architecture with proper applesauce account system
- Add applesauce-accounts dependency to package.json

This provides a more robust and standardized approach to nostr account
management using the applesauce ecosystem.

node_modules/.package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "markr",
-  "version": "0.1.0",
+  "version": "0.0.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {