Run godot --convert-3to4 (automated conversion)

Apply Godot 4.6 automated conversion: renames Spatial.translate->position,
margin_*->offset_*, tool->@tool, .empty()->.is_empty(), DynamicFont->FontFile,
onready->@onready, export()->@export, and many more.

127 files changed by the tool. Manual fixes still required for:
 - godot_db_manager plugin (incompatible APIs: WindowDialog, Tabs, etc.)
 - lod plugin (Spatial -> Node3D renames)
 - ResourceLoader.load_interactive removed -> load_threaded_request
 - OS.set_window_fullscreen removed -> DisplayServer
 - Viewport.set_size_override removed

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scenes/UI/loading/parts/LabelLoading.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=3 format=2]
 
-[ext_resource path="res://assets/fonts/kirsty/kirsty_title.tres" type="DynamicFont" id=1]
+[ext_resource path="res://assets/fonts/kirsty/kirsty_title.tres" type="FontFile" id=1]
 [ext_resource path="res://scenes/UI/loading/Loading.gd" type="Script" id=2]
 
 [node name="VBoxLoading" type="VBoxContainer"]
@@ -8,13 +8,13 @@ anchor_left = 0.5
 anchor_top = 0.5
 anchor_right = 0.5
 anchor_bottom = 0.5
-margin_left = -96.5
-margin_top = -28.0
-margin_right = 96.5
-margin_bottom = 28.0
+offset_left = -96.5
+offset_top = -28.0
+offset_right = 96.5
+offset_bottom = 28.0
 size_flags_horizontal = 0
 size_flags_vertical = 0
-custom_constants/separation = 0
+theme_override_constants/separation = 0
 alignment = 1
 script = ExtResource( 2 )
 __meta__ = {
@@ -22,10 +22,10 @@ __meta__ = {
 }
 
 [node name="LabelLoading" type="Label" parent="."]
-margin_right = 193.0
-margin_bottom = 56.0
-custom_fonts/font = ExtResource( 1 )
-custom_colors/font_color = Color( 0.74902, 0.701961, 0.65098, 1 )
+offset_right = 193.0
+offset_bottom = 56.0
+theme_override_fonts/font = ExtResource( 1 )
+theme_override_colors/font_color = Color( 0.74902, 0.701961, 0.65098, 1 )
 text = "loading"
 align = 1
 valign = 2