[ENHANCEMENT] Stage Editor - Null characters and open target song stage with song characters #5264
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Linked Issues
Fixes #3850
Description
#4116 this and #4114 this but for the stage editor too.
There's one strange issue I noticed, opening the character data toolbox when there's a null character, without changing characters sets test bf z-index to 0?
Note, there's bound to be issues with this awkward way of allowing null test characters in the stage editor, but nothing that can't be changed or fixed in the future I'm sure.
Screenshots/Videos
Test characters can start as null (can't be set as null though, as that's more work and kinda useless anyway):


Opening the stage of a song in freeplay:
2025-06-24.21-26-44.1.mp4
Opening the stage of playstate song:
2025-06-24.21-39-38.mp4