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marked v15 does not filter dangerous URL protocols. The default link renderer passes href values through verbatim, so markdown like `[click](javascript:alert(1))` renders as a clickable XSS link in shared/exported session HTML. Add custom link and image renderers that: - Block javascript:, vbscript:, and data: protocol URLs - Escape href/title/alt attributes via escapeHtml() Also escape img.mimeType in session image rendering to prevent attribute breakout from crafted session JSONL. Fixes #3531