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Upload QuickBooks / CSV — Web Worker Streaming (P0)
Frontend Lead fix: Parsing offloaded to Web Worker + PapaParse chunked streaming. No main thread blocking. Fuzzy column mapping: amount, vendor, date, category. Memory safe via virtualized list.
Drop file to parse — zero data leaves browser. Schema detection: fuzzy mapping handles $ , commas, unexpected headers.
Web Worker • Decimal.js • Virtualized • CSP hardened • stackcut-v2 local
Your stack live audit — P0 hardened
P0 QA/Frontend: Decimal arithmetic (no $49.9999 drift), Web Worker CSV streaming (no freeze), virtualized list (no memory leak). P2 Backend: Secure ephemeral token for $49 report — server compiles metrics, never raw lines.