feat(web): add optimistic rendering for day view event creation

[Copilot]

Events created in day view disappear temporarily during DB save, then reappear. Week view already handles this with optimistic rendering.

Changes

The issue was that optimistic event operations only updated getWeekEventsSlice. Day view reads from getDayEventsSlice, so optimistic events weren't visible.

Updated saga.util.ts:

• insertOptimisticEvent: Insert into both week and day slices
• replaceOptimisticId: Replace IDs in both slices

Updated event.sagas.ts:

• deleteEvent: Delete from both slices
• convertCalendarToSomedayEvent: Restore to both slices on error

// Before
yield put(getWeekEventsSlice.actions.insert(event._id!));

// After
yield put(getWeekEventsSlice.actions.insert(event._id!));
yield put(getDayEventsSlice.actions.insert(event._id!));

Day and week views use independent slices and selectors, so events must be added to both for visibility in either view.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Optimistically render events from day view</issue_title>
<issue_description>### Priority

Medium (nice to have)

Feature Description

When a user creates a new event from the day view, the event should always appear on the screen immediately. Currenly, the event preview appears, but then it disappears temporarily as the event is being saved to the DB and returned. Instead, we should optimistically render the event to ensure a smoother UX.

Use Case

No response

Additional Context

This optimistic rendering pattern is already present in the week view. Follow that same pattern.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Optimistically render events from day view #1394

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[Copilot]

Pull request overview

This PR adds optimistic rendering support for event creation in the day view, addressing a UX issue where newly created events temporarily disappeared during the database save operation. The implementation follows the existing pattern already used in the week view.

Key Changes:

• Updated saga utilities to insert and replace optimistic events in both week and day slices
• Modified event sagas to delete from and restore to both slices during error handling
• Added comprehensive test coverage for the optimistic rendering behavior

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/web/src/ducks/events/sagas/saga.util.ts	Extended insertOptimisticEvent and replaceOptimisticId to update both week and day slices for calendar events
packages/web/src/ducks/events/sagas/event.sagas.ts	Updated deleteEvent and convertCalendarToSomedayEvent error handling to maintain consistency across both slices
packages/web/src/ducks/events/sagas/event.sagas.test.ts	Added comprehensive integration tests verifying optimistic event creation, ID replacement, and persistence throughout the lifecycle

The changes are well-structured, consistent, and properly tested. The implementation correctly handles the independent nature of day and week slices by ensuring all optimistic operations update both slices for calendar events (non-someday events).

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.