Configurable date range in widget

Is your feature request related to a problem? Please describe.

Our organization has very few but important events spread over the year. When I enter them into shared calendar, the events do not appear in the widget until 14 days before. Which is far too short to alert members of them, while leaving a lot of unnecessary empty space on the widget.

Examining the source code, it appears the Calendar app has a hard-coded range of dates to show events in the widget:

$inTwoWeeks = $dateTime->add(new DateInterval('P14D'));
$options = [
        'timerange' => [
                'start' => $dateTime,
                'end' => $inTwoWeeks,
        ]
];

Describe the solution you'd like

Maybe a config/config.php setting could be introduced to make this configurable:

'calendar.widget.date_range' => 'P1Y',

There is still a number limit (default to 5) of maximum events shown, which shall prevent flooding the widget with too many events when using long date ranges.

Describe alternatives you've considered

I've tried to change the PHP source code, but due to Nextcloud app signing and caching, I was unable to change the date range of events shown in the widget.

Additional context

No response

Find the widget code containing the hard-coded P14D range and review config/config.php handling before deciding how a date-range setting should be exposed. Confirm the implementation supports a configurable range while retaining the default five-event limit, then verify the widget behavior with an appropriate existing test or manual calendar data.