fix: fix compile time is NaN in watch

[HerringtonDarkholme]

Summary

fix #2654, we should store last startTime before resetting

Related issue (if exists)

#2654

Types of changes

• Docs change / Dependency upgrade
• Bug fix
• New feature / Improvement
• Refactoring
• Breaking change

Checklist

• I have added changeset via pnpm run changeset.
• I have added tests to cover my changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: bc9dacd

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[ahabhgk]

Thanks!