feat: Add graph browser frontend and update gitignore

- Add complete Neo4j Aura-style interface (731 lines)
- Update .gitignore to keep graph-browser/ files
- Keep generated visualization files ignored

🚀 Generated with Claude Code
Co-Authored-By: Claude <[email protected]>

Author: michaeloboyle

examples/.gitignore

@@ -1,2 +1,7 @@
-*.html
-*.json
+# Ignore generated visualization files
+job-search-*.html
+job-search-*.json
+visualization-export.ts.backup
+
+# But keep graph-browser files
+!graph-browser/