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>

addons/godot_db_manager/db_editor.tscn

@@ -8,10 +8,10 @@
 [ext_resource path="res://addons/godot_db_manager/dlgs/delete_table_dlg.tscn" type="PackedScene" id=6]
 [ext_resource path="res://addons/godot_db_manager/debug/dbg.tscn" type="PackedScene" id=7]
 
-[node name="db_editor" type="Tabs"]
+[node name="db_editor" type="TabBar"]
 anchor_right = 1.0
 anchor_bottom = 1.0
-tab_align = 0
+tab_alignment = 0
 tab_close_display_policy = 2
 script = ExtResource( 1 )
 __meta__ = {
@@ -21,11 +21,11 @@ __meta__ = {
 
 [node name="tables_list" parent="." instance=ExtResource( 2 )]
 anchor_right = 0.0
-margin_right = 170.0
-rect_min_size = Vector2( 180, 30 )
+offset_right = 170.0
+custom_minimum_size = Vector2( 180, 30 )
 
 [node name="table_editor" parent="." instance=ExtResource( 4 )]
-margin_left = 181.0
+offset_left = 181.0
 
 [node name="dbg" parent="." instance=ExtResource( 7 )]
 visible = false