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fix(web): protect CSV cells with formula prefixes hidden by whitespace - #104
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Security
All DataTable CSV exports (including the upcoming filtered findings export) now protect text that can look like a spreadsheet formula even after leading spaces, tabs, control bytes or a BOM. Fields beginning with whitespace are quoted correctly; numeric cells remain numeric.
Tests
Extend existing component CSV regression tests with padded formula strings, tab/newline prefixes, normal padded text and earlier formulas. Verified the edge-case examples independently with a small Node smoke check; full web CI still required.
Documentation
Clarify the export guarantee in the web guide and add an Unreleased security entry. No version bump or release.