Enable calendar event creation from Day view grid

[Copilot]

• Explore codebase and understand existing patterns
• Analyze Calendar view's grid event creation implementation
• Analyze Day view's Agenda component structure
• Create context for draft event management in Day view (DayDraftContext)
• Add click handler to Agenda grid for event creation
• Implement event form modal with prefilled date/time
• Create utility function for calculating time from click position (getTimeFromPosition)
• Wire up event creation via Redux actions (createEventSlice)
• Add tests for new functionality (getTimeFromPosition tests)
• Run linting and verify all tests pass (1226 tests passing)
• Run code review and address feedback
• Run CodeQL security check (no issues found)
• Fix missing origin field causing backend 400 error

Original prompt

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This section details on the original issue you should resolve

<issue_title>Enable creation of calendar event from the grid</issue_title>
<issue_description>## Summary

Implement the ability for users to create a calendar event directly from the Day view Agenda grid interface.

Scope

• Allow users to select a time block or cell in the grid to initiate event creation
• Display event creation modal pre-filled with data from the selection (date/time)
• Persist created event and reflect changes immediately on the grid
• Validate event data, handle errors, and provide feedback
• Support quick add (minimal fields) and advanced event creation

Acceptance Criteria

• User can create events from calendar grid (single/multi-block selection)
• Relevant modal fields are prefilled based on user interaction
• Persisted events reflected without reload
• Input validation and error handling included

Additional Context

• Leverage grid event creation patterns in codebase
• Reference UX flow and files for grid selection/interaction.</issue_description>

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

• Fixes Enable creation of timed calendar event from the grid #1318

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[victor-enogwe]

@copilot check that the event creation request actually works. The backend returns error 400 due to missing event origin field

[Copilot]

@copilot check that the event creation request actually works. The backend returns error 400 due to missing event origin field

Added the missing origin: Origin.COMPASS field to the draft event in DayDraftContext.tsx. The backend validation should now pass. Fixed in commit a9d8217.