- hand sweeps down the button panel at game start
- button panel now spawns its floor buttons procedurally via button_panel.gd
- elevator_panel waits for the new intro_finished signal before starting floor 1
- removes the stray ShaftStrip from hud.tscn
- cleaned up timing but henry will probably want to tune further
Add a button scene, as well as a button scene. Each button has an Area3D to detect collisons; a two-row sprite sheet contains all of the numbers and their on/off state.
