Auto-Generate Venue from Day Location on Mobile (DSM-1521)

Currently, creating a "Show Day" requires redundant data entry: users must input the location for the day and then manually re-enter those same details to create the Venue.

This feature introduces an optional "Use as Venue" step within the Day Details flow when creating a tour, or when editing a single targeted day. This allows users to automatically generate a Venue object directly from the Day Location, eliminating double handling and streamlining the tour creation workflow.