Refetch after deleting or optimistically delete events (day view) #1222

Priority

None

Feature Description

Add the ability to refetch event data after deletion in the day view, or implement optimistic deletion to update UI instantly. Improves consistency and user feedback after event deletion.

Use Case

Allows users to see up-to-date calendar data immediately after deleting events without having to refresh or wait for a slow sync. Makes for a smoother experience when cleaning up daily plans.

Additional Context

Held for post-MVP. Target after main data layer changes are completed.