Improves code organization and maintainability by separating concerns related to all-day event rendering, header management, and event resizing.
Moves all-day event rendering logic into a dedicated `AllDayEventRenderer` class, utilizing the factory pattern for event element creation.
Refactors `AllDayManager` to handle all-day row height animations, separated from `HeaderManager`.
Removes the `ResizeManager` and related functionality.
These changes aim to reduce code duplication, improve testability, and enhance the overall architecture of the calendar component.
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