fix(Markdown): Escape open video tags

[dreamwasp]

Overview

Fixes Markdown rendering breaking on open video tags.

PR Checklist

• Related to designs:
• Related to JIRA ticket: GMT-1814
• Version plan added/updated (or not needed)
• I have run this code to verify it works
• This PR includes unit tests for the code change
• This PR includes testing instructions tests for the code change
• The alpha package of this PR is passing end-to-end tests in all relevant Codecademy repositories

Testing Instructions

1. Go to the Markdown story
2. See that the open tags don't break rendering anymore
3. You can also check out the page in the LE that no longer breaks

PR Links and Envs

Repository	PR Link
Monolith	Monolith PR
Mono	Mono PR

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 2187055

---

☁️ Nx Cloud last updated this comment at 2026-10-19 13:28:18 UTC

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.85%. Comparing base (a5aad92) to head (54a6cd2).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ckages/gamut/src/Markdown/libs/overrides/utils.tsx	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3442      +/-   ##
==========================================
- Coverage   91.34%   90.85%   -0.49%     
==========================================
  Files         407      277     -130     
  Lines        6873     5949     -924     
  Branches     2210     2020     -190     
==========================================
- Hits         6278     5405     -873     
+ Misses        586      535      -51     
  Partials        9        9              

Flag	Coverage Δ
main	?
pull-request	90.85% <92.85%> (?)

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[codecademydev]

📬 Published Alpha Packages:

Package	Version	npm	Diff
@codecademy/gamut	74.0.1-alpha.a24e4a.0	npm	diff
@codecademy/gamut-icons	10.2.1-alpha.a24e4a.0	npm	diff
@codecademy/gamut-illustrations	1.1.1-alpha.a24e4a.0	npm	diff
@codecademy/gamut-kit	3.0.28-alpha.a24e4a.0	npm	diff
@codecademy/gamut-patterns	1.1.1-alpha.a24e4a.0	npm	diff
@codecademy/gamut-styles	21.2.1-alpha.a24e4a.0	npm	diff
@codecademy/gamut-tests	7.1.1-alpha.a24e4a.0	npm	diff
@codecademy/variance	1.1.1-alpha.a24e4a.0	npm	diff
eslint-plugin-gamut	3.1.1-alpha.a24e4a.0	npm	diff

[github-actions]

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