Add comprehensive sign.html test and update documentation

- Add examples/sign.html with comprehensive extension compatibility testing
- Update README.md with profile fetching API documentation
- Update .gitignore for better file management
- Update examples/button.html and examples/modal.html with latest features

This completes the single-extension architecture implementation with:
- nos2x compatibility through true single-extension mode
- Method switching between extension/local/NIP-46/readonly
- Enhanced profile fetching for floating tab
- Comprehensive debugging and testing capabilities

README.md

@@ -24,6 +24,11 @@ await NOSTR_LOGIN_LITE.init({
     enabled: true,
     hPosition: 0.95,        // 0.0-1.0 or '95%' from left
     vPosition: 0.5,         // 0.0-1.0 or '50%' from top
+    getUserInfo: true,      // Fetch user profile name from relays
+    getUserRelay: [         // Relays for profile queries
+      'wss://relay.damus.io',
+      'wss://nos.lol'
+    ],
     appearance: {
       style: 'pill',        // 'pill', 'square', 'circle', 'minimal'
       theme: 'auto',        // 'auto' follows main theme