style: apply gdformat formatting across the entire project

Auto-format all GDScript files using gdformat from gdtoolkit.
This is a baseline formatting pass to ensure consistent style:

- Normalizes indentation and spacing
- Wraps long lines to 100 characters
- Removes trailing whitespace
- Standardizes blank lines between functions

68 files reformatted, 8 files left unchanged (3rd-party addon files
with parse errors excluded).

demo/src/DemoScene.gd

@@ -9,15 +9,16 @@ func _ready():
 		$UI.player = $Player
 
 	# Load Sky3D into the demo environment if enabled
-	if Engine.is_editor_hint() and has_node("Environment") and \
-		Engine.get_singleton(&"EditorInterface").is_plugin_enabled("sky_3d"):
-			$Environment.queue_free()
-			var sky3d = load("res://addons/sky_3d/src/Sky3D.gd").new()
-			sky3d.name = "Sky3D"
-			add_child(sky3d, true)
-			move_child(sky3d, 1)
-			sky3d.owner = self
-			sky3d.current_time = 10
-			sky3d.enable_editor_time = false
-			
-		
+	if (
+		Engine.is_editor_hint()
+		and has_node("Environment")
+		and Engine.get_singleton(&"EditorInterface").is_plugin_enabled("sky_3d")
+	):
+		$Environment.queue_free()
+		var sky3d = load("res://addons/sky_3d/src/Sky3D.gd").new()
+		sky3d.name = "Sky3D"
+		add_child(sky3d, true)
+		move_child(sky3d, 1)
+		sky3d.owner = self
+		sky3d.current_time = 10
+		sky3d.enable_editor_time = false