==== Goal
We should allow check users to specify a time range for their investigations. This is in keeping with Special:CheckUser and allows them to focus their investigations, e.g. if there are too many results (following T245499, which imposes limits).
==== Mocks
|{F31656774, width=400}|{F31656776, width=400}|
==== Acceptance criteria:
* Add an OOUI dropdown for //Duration// in the input form with the same options as currently in CheckUser:
** All
** Last week
** Last 2 weeks
** Last 30 days
* When the user picks a time window, the results are generated for that time window only.
!!Question!!: Should we allow a user to change the investigation time period from the results (Preliminary check/Compare/Timeline) page or will they have to start a new investigation if they want to do that?
!!Question!!: What should the default time period be?