fix: strip avatar and profile from children payload in managed event type updates

[alishaz-polymath]

What does this PR do?

When assigning users to a large managed event type (~85+ users), the update request fails with a "Body exceeded 1mb limit" error. The root cause is that the full ChildrenEventType objects—including avatar (potentially large base64 data URLs), profile, username, and membership—are sent in the mutation payload, even though the server Zod schema (childSchema) only needs owner.{id, name, email, eventTypeSlugs} and hidden.

This PR strips the children array down to only server-required fields in handleSubmit before sending the mutation, while keeping the full data in form state for UI display (e.g., avatar rendering in ChildrenEventTypeSelect).

The stripping logic is extracted into a shared stripChildrenForPayload utility in packages/features/eventtypes/lib/childrenEventType.ts, which is imported by both the hook and the test file—avoiding code duplication.

How should this be tested?

1. Create a managed event type in an organization with ~85+ team members
2. Assign all members to the managed event type
3. Save the event type — previously this would fail with "Body exceeded 1mb limit"; now it should succeed
4. Verify the assigned members list still displays correctly with avatars in the UI

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

Human Review Checklist

• Verify the stripped fields (owner.{id, name, email, eventTypeSlugs}, hidden) match exactly what the server childSchema in packages/trpc/server/routers/viewer/eventTypes/types.ts expects
• Confirm the full children data (with avatars) is still available in react-hook-form state for UI rendering — note that children is extracted from values on line 303 (before dirty field filtering), while strippedChildren is only used for the outgoing payload
• Verify stripChildrenForPayload in childrenEventType.ts is correctly shared between the hook and the test file (no duplicated logic)

Updates since last revision

• Addressed Cubic AI review feedback (confidence 9/10): Extracted inline stripping logic from useEventTypeForm.ts into a shared exported stripChildrenForPayload() function in packages/features/eventtypes/lib/childrenEventType.ts. The test file now imports and tests the actual production function instead of maintaining a mirrored copy.

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[cubic-dev-ai]

1 issue found across 2 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="packages/platform/atoms/event-types/hooks/useEventTypeForm.test.ts">

<violation number="1" location="packages/platform/atoms/event-types/hooks/useEventTypeForm.test.ts:11">
P1: Test duplicates production logic instead of importing it</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[github-actions]

Devin AI is addressing Cubic AI's review feedback

A Devin session has been created to address the issues identified by Cubic AI.

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[hariombalhara]

LGTM !!