[Maintenance] - Fix teamTypeId Incoming as Empty String

Description

This error stems from teamTypeId in the EventModal.tsx form data defaulting to an empty string and being allowed to proceed to the API. When it gets to the API it errors because there is no teamTypeId with a value of empty string.

Acceptance Criteria

• Add a guard to make sure that data.teamTypeId can never be an empty string

Proposed Solution

Within EventModal.tsx:

In buildPayload, only include teamTypeId when relevant, and normalize empty string to undefined.

In handleEventTypeChange, clear the fields that aren't relevant to the newly selected type... Something like:

if (!newEventType?.teamType) setValue('teamTypeId', undefined);
if (!newEventType?.location) setValue('location', undefined);
if (!newEventType?.shop) setValue('shopIds', []);
if (!newEventType?.machinery) setValue('machineryIds', []);
if (!newEventType?.workPackage) setValue('workPackageIds', []);

Mocks

No response

Start in EventModal.tsx, focusing on buildPayload and handleEventTypeChange. Trace how teamTypeId moves from form data to the API, then ensure an empty string is never included and irrelevant fields are cleared when the event type changes. Done means the payload omits teamTypeId when it is not applicable and no longer sends an empty string.