Update full-day date range defaults

[felixgollnhuber]

Summary

• Set the default date range for full-day events to start today and extend one month ahead.
• Keep the existing time-grid default range unchanged.
• Add coverage for the full-day UI label and submitted date span.

Testing

• Added and updated unit/UI coverage in src/components/create-event-form.test.tsx.
• Verified the focused component test suite locally.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Updates the Create Event form so full-day events default to a “today → one month ahead” date range while keeping the existing time-grid defaults, and adds UI/submission assertions to cover the new behavior.

Changes:

• Added full-day default date range logic (today through +1 month) while preserving the time-grid default range.
• Updated event type selection to reset date range only when the user is still on the current default.
• Expanded CreateEventForm tests to assert the full-day range label and submitted date span.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/components/create-event-form.tsx	Introduces new default date range helpers and updates event-type switching behavior to apply appropriate defaults.
src/components/create-event-form.test.tsx	Adds assertions for full-day date range label and submitted date boundaries.

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