Add HUD scene with elevator hack timing minigame

- elevator panel w/ a screen and close button
- screen.gd timing minigame: sweep line bounces across a shrinking target zone
- hud wiring to move down floors on successful hacks, countdown/win states, and speed up AI on misses

project.godot

@@ -11,6 +11,7 @@ config_version=5
 [application]
 
 config/name="tojam20-elevator"
+run/main_scene="uid://d4j36ro8y55ep"
 config/features=PackedStringArray("4.6", "Forward Plus")
 config/icon="res://icon.svg"