feat(companion): add optimistic updates to EventTypeDetail screen

[dhairyashiil]

What does this PR do?

This PR adds optimistic updates to the EventTypeDetail screen in the companion app, ensuring the event types list updates immediately after save/delete operations without requiring manual refresh.

Note: This is a stacked PR that depends on #26931 (feat/companion-auto-reload-on-save).

Changes:

1. Enhanced useUpdateEventType hook with full optimistic update support:

   • Added onMutate callback to update cache immediately before server response
   • Added onSuccess callback to sync cache with server response
   • Added onError callback to rollback cache on failure
   • Updates both eventTypes.detail(id) and eventTypes.lists() caches

2. Refactored handleSave in event-type-detail.tsx:

   • Replaced direct CalComAPIService.updateEventType() with useUpdateEventType hook
   • Replaced direct CalComAPIService.createEventType() with useCreateEventType hook
   • Removed manual fetchEventTypeData() call after save (cache updates automatically)

3. Refactored handleDelete in event-type-detail.tsx:

   • Replaced direct CalComAPIService.deleteEventType() with useDeleteEventType hook

4. Replaced local saving state with mutation hooks' isPending states (isUpdating || isCreating)

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 - internal companion app changes only.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

1. Test on iOS and Android devices/simulators

2. Test update flow:

   • Go to Event Types list
   • Tap an event type to open detail screen
   • Make changes (e.g., change title, duration, etc.)
   • Save changes
   • Navigate back to list
   • Expected: List should show updated values immediately without manual refresh

3. Test delete flow:

   • Go to Event Types list
   • Tap an event type to open detail screen
   • Delete the event type
   • Expected: Should navigate back and list should update immediately

4. Test error rollback:

   • Simulate a network error during save
   • Expected: UI should rollback to previous state

Human Review Checklist

• Test optimistic updates work correctly on both iOS and Android
• Verify error rollback restores previous cache state
• Note: eventTypeData local state is not synced after update - dirty-checking may compare against stale baseline after first save. This is a known limitation that may need follow-up work if it causes issues.

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Link to Devin run: https://app.devin.ai/sessions/0e35f5cdab8943dabb66fc182e4241fe
Requested by: Dhairyashil Shinde (@dhairyashiil)

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[cubic-dev-ai]

2 issues found across 2 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="companion/hooks/useEventTypes.ts">

<violation number="1" location="companion/hooks/useEventTypes.ts:128">
P2: Widening `updates` to `Record<string, unknown>` removes the compile-time contract with `CreateEventTypeInput`, so callers can now send invalid payload shapes that the API will only reject at runtime. Keep the hook typed as `Partial<CreateEventTypeInput>` (cast for cache merges if needed) to preserve type safety.</violation>
</file>

<file name="companion/app/(tabs)/(event-types)/event-type-detail.tsx">

<violation number="1" location="companion/app/(tabs)/(event-types)/event-type-detail.tsx:1257">
P2: `eventTypeData` is never synced after a successful update anymore, so dirty-checking compares against stale data. After saving once, `isDirty` stays true and reverting a field back to its original value no longer triggers an update because the baseline still matches the old value.</violation>
</file>

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✅ Pushed commit 711cf29