fix(forms): Fix form z-index regression

[mbeutt-cb]

Summary

• Commit a9c5b01 caused a regression that led to form selects having too low of a z-index to display over the modal panel
• Now displays properly and the initial fix in the regression commit still functions as expected

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

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Project	Deployment	Actions	Updated (UTC)
omni-ui	Ready	Preview	Aug 1, 2026 7:01pm

[cb-heimdall]

Review Error for chunter-cb @ 2026-08-03 11:08:21 UTC
User failed mfa authentication, either user does not exist or public email is not set on your github profile. \ see go/mfa-help