chat-ui

310c50a0 - refactor(markdown): replace htmlparser2 with regex-based sanitizer

refactor(markdown): replace htmlparser2 with regex-based sanitizer Replace htmlparser2 (56KB gzipped) with a zero-dependency regex-based HTML sanitizer for video/audio/source tags. Security approach: fail-closed - Only video, audio, source tags allowed - Strict attribute allowlist (src, controls, type, etc.) - Block javascript:, vbscript:, and data:text/html URIs - If ANY disallowed content detected, escape entire input