Add actions and double click handlers

    def on_delivery_failed(self) -> None:

        self.notify("Speichern fehlgeschlagen", severity="error")

    def on_persons_table_double_click(self, event: PersonsTable.DoubleClick) -> None:

        if event.column == PersonsTableColumn.balance:

            self._open_balance_dialog(event.person)

        else:

            self._open_person_dialog(event.person)

    def action_change_person(self) -> None:

        self._open_person_dialog(self._selected_person)

    def action_change_balance(self) -> None:

        self._open_balance_dialog(self._selected_person)

    def action_delete_person(self) -> None:

        self._open_delete_dialog(self._selected_person)

    def action_reload(self) -> None:

        table = self.query_one(PersonsTable)

        table.reload()