PlayerController gets a BaseLevelNameOverride property. When set (e.g. "Warehouse"),
scenes are tagged with that level name instead of the auto-detected map name.
Use case: editing on "Warehouse_Editor" map but scenes should be associated
with the "Warehouse" base level for PROSERVE runtime loading.
Save, load list, and scene filtering all respect this override.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>