DO NOT MERGE: SelectDropdown React 18 + 19 Beta

[dreamwasp]

Summary

• Combines cass-gmt-1473-beta (React 18/19 beta support) with cass-gmt-292 (SelectDropdown changes)
• Non-SelectDropdown conflicts defer to cass-gmt-1473-beta; SelectDropdown conflicts defer to cass-gmt-292

⚠️ DO NOT MERGE — this is an integration branch for testing SelectDropdown compatibility under the React 18/19 beta environment.

🤖 Generated with Claude Code

[nx-cloud]

View your CI Pipeline Execution ↗ for commit e602741

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☁️ Nx Cloud last updated this comment at 2026-07-27 13:19:23 UTC

[nx-cloud]

View your CI Pipeline Execution ↗ for commit a0925e4

---

☁️ Nx Cloud last updated this comment at 2026-06-30 13:02:04 UTC

[codecov]

Codecov Report

❌ Patch coverage is 94.97908% with 12 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@f96f976). Learn more about missing BASE report.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...src/Form/SelectDropdown/hooks/useSelectHandlers.ts	87.50%	5 Missing ⚠️
packages/gamut/src/PopoverContainer/hooks.ts	86.95%	3 Missing ⚠️
...t/src/Form/SelectDropdown/elements/multi-value.tsx	0.00%	1 Missing ⚠️
packages/gamut/src/Popover/Popover.tsx	88.88%	1 Missing ⚠️
...es/gamut/src/PopoverContainer/PopoverContainer.tsx	87.50%	1 Missing ⚠️
packages/gamut/src/Tag/index.tsx	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3389   +/-   ##
=======================================
  Coverage        ?   90.81%           
=======================================
  Files           ?      382           
  Lines           ?     6318           
  Branches        ?     2086           
=======================================
  Hits            ?     5738           
  Misses          ?      571           
  Partials        ?        9           

Flag	Coverage Δ
pull-request	90.81% <94.97%> (?)

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[codecademydev]

📬 Published Alpha Packages:

Package	Version	npm	Diff
@codecademy/gamut	72.3.1-alpha.3a0dcc.0	npm	diff
@codecademy/gamut-icons	9.57.11-alpha.3a0dcc.0	npm	diff
@codecademy/gamut-illustrations	0.58.16-alpha.3a0dcc.0	npm	diff
@codecademy/gamut-kit	3.0.11-alpha.3a0dcc.0	npm	diff
@codecademy/gamut-patterns	0.10.35-alpha.3a0dcc.0	npm	diff
@codecademy/gamut-styles	20.0.3-alpha.3a0dcc.0	npm	diff
@codecademy/gamut-tests	6.0.6-alpha.3a0dcc.0	npm	diff
@codecademy/variance	0.26.2-alpha.3a0dcc.0	npm	diff
eslint-plugin-gamut	2.4.4-alpha.3a0dcc.0	npm	diff

[github-actions]

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