Adds options for technical date and time formatting and includes the option to show seconds.
Updates time formatting to use UTC-to-local conversion and ensures consistent colon separators for time values.
Adjusts all-day event handling to preserve original start/end times.
Addresses inconsistent time formatting and lack of timezone
handling throughout the application by introducing a
`TimeFormatter` utility.
This class centralizes time formatting logic, providing
timezone conversion (defaults to Europe/Copenhagen) and
support for both 12-hour and 24-hour formats, configurable
via `CalendarConfig`.
It also updates event rendering to utilize the new
`TimeFormatter` for consistent time displays.
