perf(web): avoid quadratic markdown link scans (#18387)

Co-authored-by: SAPHID <saphid@users.noreply.github.com>
Co-authored-by: GPT-6.1 Sol <noreply@openai.com>
8569ce962aAlex Southwell committed on 10/12/2026, 12:38:17 AM· committed by GitHubparent7ab28a3
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