Fix stray indentation in dashboard

Move ingest button above sample docs

Add real-time ingestion status and sample docs display in dashboard

Fix extract_entity_names: remove unused query parameter

Add retry with exponential backoff to extractor and synthesizer; add delay between chunk extractions

Add missing close() function to vector_store

Fix type hints: use Optional[] instead of X | None for Neo4j/Pinecone types

Initial commit: Neo4j GraphRAG Engine