feat: display user profile name instead of public key

- Fetch user profile from nostr relay on login
- Display NIP-05, display name, or username instead of public key
- Priority: NIP-05 > name > username > public key
- Add WebSocket connection to fetch profile events (kind 0)
- Update Login component to fetch and pass profile data
- Update Bookmarks component to show user-friendly display name
- Fallback to formatted public key if no profile available
- Improve user experience with recognizable identity

.cursor/rules/always-commit.mdc

@@ -0,0 +1,5 @@
+---
+alwaysApply: true
+---
+
+Commit all pending changes. Commit using conventional commits. Always commit after each implementation step or change.