Use query string fallback for calendar pager in non-page displays

This is a quickfix but it needs a pager that reads the value too, though it is better than nothing as someone could write a Views argument or argument default plugin that would read from the query string.

Side comment in the issue summary I wrote ?month=2025-04 even though I know in D8+ the month arg is in Ym format. I would like to see this easily configurable because ?month=202504 is practical but not a great hackable/human parseable URL

joelpittet → credited ramil g → .