Centralizes date calculation logic into a dedicated DateCalculator
class for improved maintainability and testability.
Removes redundant date calculation methods from CalendarManager,
ColumnRenderer, HeaderRenderer and NavigationRenderer, and utilizes
the DateCalculator for these calculations.
Updates components to use DateCalculator for consistent date
handling, including week start determination, date formatting,
and "is today" checks.
Implements configurable work week presets, allowing users to customize the days displayed in the calendar.
This includes:
- Defining work week settings (work days, day names, total days).
- Providing predefined work week presets (standard, compressed, weekend, full week).
- Adding UI elements to switch between presets.
- Updating grid and header rendering logic to reflect the selected work week.
- Emitting events when the work week changes, triggering necessary UI updates and data re-renders.
This provides a more flexible and personalized calendar experience.
Renames 'week header' to 'calendar header' for better representation
of the component's purpose, which includes more than just week-based
calendar views.
Updates related methods and references in GridManager and
ScrollManager to reflect the change.
Fixes incorrect calculation of the column width.
