Frontend/build: Don't emit code while typechecking

[tristanlabelle]

Type-checking doesn't require emitting code. It might make the operation faster, or at least it won't write files we don't need to the disk.

Testing

Introduced a type error locally and ran yarn typecheck.

Web frontend checklist

• There are no console warnings when running the app
• Added tests where relevant
• Clicked around my changes running locally and it works
• Checked Desktop, Mobile and Tablet screen sizes

For maintainers

• Maintainers can push commits to my branch
• Maintainers can merge this PR for me

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Project	Deployment	Actions	Updated (UTC)
couchers	Ready	Preview	Mar 18, 2026 7:55am

[github-actions]

📝 Release Notes

This PR does not need to be included in release notes.

Reason: This PR only changes the frontend typecheck command to avoid emitting build artifacts during type checking. It's a developer workflow/build optimization with no user-facing impact and not a major infrastructure change that end users would notice.

🤖 Bot Debug Information

Model: couchers.openai.gpt-5.4
Decision: exclude
Reasoning: This PR only changes the frontend typecheck command to avoid emitting build artifacts during type checking. It's a developer workflow/build optimization with no user-facing impact and not a major infrastructure change that end users would notice.