DatePicker

Renders a read-only text field that opens a Material 3 date picker dialog when tapped. kind picks the field style — filled or outlined. Always shows a calendar leading icon, displays selectedDate (empty when null, as an ISO yyyy-MM-dd string), forwards enabled and supportingText, and switches to Material's error styling when state is error. Typing is impossible — the field is read-only. Opening, closing and date selection are handled entirely on the client: pressing the field opens the dialog, confirming stores the picked date and closes it, cancelling or dismissing just closes it — none of this needs a round trip to the server. The dialog's buttons are labelled with confirmLabel and cancelLabel, and the confirm button stays disabled until a date is picked, so confirming always yields a date. Dispatches onDatePickerOpen when pressed while closed, onDateSelected (carrying the ISO date string) when confirmed, and onDatePickerClose when pressed while open, dismissed, cancelled, or right after a confirm. The current selectedDate can be read from this tile by its id via GetData — it produces no entry at all when no date is selected.

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