default Date Formatter
The default date formatter used by StylishDatePickerField, producing yyyy/MM/dd output (e.g. 2026/07/25).
The format is locale-neutral: it always uses the zero-padded Gregorian month and day numbers with ASCII digits and a forward-slash separator, regardless of the device locale. This keeps the field display stable across languages, at the cost of not following the user's locale conventions. Pass a custom com.segnities007.stylishui.components.molecules.StylishDatePickerField.formatter when a locale-aware format is required.