feat: Implement comprehensive lobby system with main menu, room management, and loading screen.

scripts/ui/loading_screen.gd

@@ -1,4 +1,4 @@
-extends Control
+extends CanvasLayer
 
 @export var tips: Array[String] = [
 	"Use your cards wisely!",
@@ -79,6 +79,14 @@ func change_scene(resource: PackedScene):
 	
 	get_tree().change_scene_to_packed(resource)
 	
+	# Update label to show we are initializing the game world
+	if scene_name_label:
+		scene_name_label.text = "Preparing Game..."
+	
+	# Wait for assets (Tektons, Spawn Tiles) to initialize in the background
+	# This keeps the loading screen visible while main.gd runs its _ready() setup
+	await get_tree().create_timer(1.2).timeout
+	
 	# Clean up self (Loading Screen)
 	queue_free()
 
@@ -86,7 +94,7 @@ func change_scene(resource: PackedScene):
 func load_level(_path: String):
 	print("Starting load for: ", _path)
 	path = _path
-	show()
+	visible = true
 	content_control.show()
 	
 	if scene_name_label: