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New ChunkBrowserQA component replaces inline chunk browser with: - Document sidebar with live chunk counts per regulation (batched Qdrant count API) - Sequential chunk navigation with arrow keys (1/N through all chunks of a document) - Overlap display showing previous/next chunk boundaries (amber-highlighted) - Split-view with original PDF via iframe (estimated page from chunk index) - Adjustable chunks-per-page ratio for PDF page estimation Extracts REGULATIONS_IN_RAG and REGULATION_INFO to shared rag-constants.ts. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>