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).

addons/terrain_3d/src/gradient_operation_builder.gd

@@ -2,7 +2,6 @@
 # Gradient Operation Builder for Terrain3D
 extends "res://addons/terrain_3d/src/operation_builder.gd"
 
-
 const MultiPicker: Script = preload("res://addons/terrain_3d/src/multi_picker.gd")
 
 
@@ -31,26 +30,28 @@ func is_ready() -> bool:
 	return _get_point_picker().all_points_selected() and not _is_drawable()
 
 
-func apply_operation(p_editor: Terrain3DEditor, p_global_position: Vector3, p_camera_direction: float) -> void:
+func apply_operation(
+	p_editor: Terrain3DEditor, p_global_position: Vector3, p_camera_direction: float
+) -> void:
 	var points: PackedVector3Array = _get_point_picker().get_points()
 	assert(points.size() == 2)
 	assert(not _is_drawable())
-	
+
 	var brush_size: float = _get_brush_size()
 	assert(brush_size > 0.0)
-	
+
 	var start: Vector3 = points[0]
 	var end: Vector3 = points[1]
-	
+
 	p_editor.start_operation(start)
-	
+
 	var dir: Vector3 = (end - start).normalized()
-	
+
 	var pos: Vector3 = start
 	while dir.dot(end - pos) > 0.0:
 		p_editor.operate(pos, p_camera_direction)
 		pos += dir * brush_size * 0.2
-	
+
 	p_editor.stop_operation()
-	
+
 	_get_point_picker().clear()