Add .gitignore, dataset metadata, retrieval layer, and latest web/graphrag updates

Fix TS strict mode: remove unused imports, fix Tooltip formatter types in CostAnalysis"

Update Benchmark tab with live 'Run Benchmark Now' that calls API and populates real data"

Add provider selector to LiveCompare + fix UI to support all 12 providers

Add Tab 4: Graph Explorer with interactive SVG knowledge graph visualization

Add Tab 3: Cost Analysis with cumulative cost chart and projections

Add Tab 2: Benchmark with radar chart and data table

Add Tab 1: Live Query Comparison with side-by-side pipeline display