fix: handle email invites in team event-type assignment by preventing NaN userId

[korrica1-design]

… NaN userId.

What does this PR do?

• Fixes feat: allow emails and invite people to a team event-type directly from assignment #23467
• Fixes CAL-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

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Summary by cubic

Prevented NaN userId when assigning hosts in team event types. Email invite options now map to userId 0 for consistent member assignment.

• Bug Fixes
  • Set userId to 0 when the option is an email invite or value is not a number, matching the Linear issue requirement to correctly handle email-invite members.

^{Written for commit a7e074b. Summary will update on new commits.}

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[korrica1-design]

I've resolved the merge conflicts and applied a fix for the NaN userId issue in AddMembersWithSwitch.tsx. This should resolve the crashes occurring during team event-type assignments via email. Ready for review! /attempt #23467

[cubic-dev-ai]

No issues found across 1 file