Restore self.update() in DateSelector.set_date()

[Copilot]

DateSelector.set_date() was mutating internal state and updating control values without calling self.update(), leaving the UI stale when invoked on an already-mounted control (e.g., date presets in invoicing, loading an entity into an editor).

Change

• Appended self.update() to DateSelector.set_date() so the control repaints after state mutation:

def set_date(self, date: Optional[datetime.date] = None):
    if date is None:
        return
    self._selected_date = date
    self._picker.value = datetime.datetime.combine(date, datetime.time())
    self._date_text.value = date.strftime(self._DATE_FMT)
    self._date_text.color = colors.text_primary
    self.update()  # restored: ensures mounted control reflects new date

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