Replace Event + GlobalAnimation autoloads with class_name + static funcs

Two of the five autoloads were stateless helper bundles, not the
persistent application-wide systems that the Godot 4 best-practice
guide reserves autoload slots for. Convert them to plain classes with
all-static methods so they no longer need a Node living under /root.

- scripts/Animation.gd -> scripts/game_animation.gd (renamed:
  conflict with the built-in Animation class; the autoload sidestepped
  it by being called GlobalAnimation). class_name GameAnimation,
  every helper static. The dissolve tween now captures its target
  material in a lambda closure, eliminating the current_material
  member that the autoload kept as shared mutable state.
- scripts/Event.gd -> scripts/event.gd, class_name Event, every
  handler static. Added Event.level_pressed(name) -> Callable for the
  one place ChooseScene needed dynamic lookup of a per-level handler
  (replaces the old _build_method('_on_' + name + '_pressed') +
  Callable(autoload, string) reflection trick with an explicit match).

Updated call sites:
- scripts/Global.gd: animation.connect('animation_started',
  Callable(Event, '...')) -> animation.animation_started.connect(
  Event._loading_is_started). Same for animation_finished.
- scenes/levels/Levels.gd: GlobalAnimation.* -> GameAnimation.*;
  Quit/TextureButton.connect('pressed', Callable(Event, '...')) ->
  pressed.connect(Event._on_main_scene_pressed).
- scenes/UI/choose_scenes/ChooseScene.gd: per-level button connects
  go through Event.level_pressed(); reset button's bound callable now
  reads Event._on_reset_level.bind(...); cleanup no longer relies on
  is_connected with an unbound Callable (which would never match a
  bound one anyway) -- iterates reset.pressed.get_connections()
  instead. Drop the now-dead _build_method helper.

Also: organise scripts/ by promoting the one-shot migration helpers
(migrate_shaders, migrate_misc, resave_scenes, devisualize_shaders,
find_visualshaders) into scripts/migration/. They are not part of
the runtime and should not be browsable next to the autoloads.

Autoload count goes 5 -> 3 (Loading, Global, Setting remain --
Setting will move to a Resource in a later refactor).

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

scripts/Animation.gd

@@ -1,43 +0,0 @@
-extends Node
-
-var current_material = null
-
-func level_hud_slide(node):
-	var animation = Animation.new()
-	var track_index = animation.add_track(Animation.TYPE_BEZIER)
-	var node_element = str(node.get_path()) + ":position:x"
-	
-	animation.track_set_path(track_index, node_element)
-	animation.bezier_track_insert_key(track_index, 0.0, 0.0, Vector2(-0.25, 0), Vector2(0.031, 190.492))
-	animation.bezier_track_insert_key(track_index, 1.0, 170, Vector2(-0.349, 2.576), Vector2(0.25, 0))
-	
-	return animation
-
-func level_hud_warning(node):
-	var animation = Animation.new()
-	var track_index = animation.add_track(Animation.TYPE_BEZIER)
-	var node_element = str(node.get_path()) + ":position:x"
-	
-	animation.track_set_path(track_index, node_element)
-	animation.bezier_track_insert_key(track_index, 0.0, 0.0, Vector2(-0.25, 0), Vector2(0, 78.1))
-	animation.bezier_track_insert_key(track_index, 0.2, 34.9, Vector2(-0.25, 0), Vector2(0, -66))
-	animation.bezier_track_insert_key(track_index, 0.4, 12.1, Vector2(0, 73.2), Vector2(0, -124.8))
-	animation.bezier_track_insert_key(track_index, 0.6, -41.9, Vector2(-0.095, 109.2), Vector2(0.062, -58.8))
-	animation.bezier_track_insert_key(track_index, 0.8, 13.3, Vector2(-0.188, 93.6), Vector2(0.196, 104.4))
-	animation.bezier_track_insert_key(track_index, 1.0, 0.0, Vector2(-0.155, -135.5), Vector2(0.25, 0))
-
-	return animation
-
-func start_dissolve(node, material):
-	if material == null:
-		return
-	current_material = material
-	var tween = node.create_tween()
-	tween.tween_method(animate_dissolve, 0.0, 1.0, 1.5) \
-		.set_trans(Tween.TRANS_LINEAR) \
-		.set_ease(Tween.EASE_IN_OUT)
-
-func animate_dissolve(progress: float) -> void:
-	if current_material == null:
-		return
-	current_material.set_shader_parameter("dissolve_amount", ease(progress, 0.4))

scripts/Animation.gd.uid

@@ -1 +0,0 @@
-uid://cgxvdwn0bwwtp

scripts/Event.gd

@@ -1,33 +0,0 @@
-extends Node
-
-## Events for loading scene
-####
-func _loading_is_started(_anim_name):
-	print("[Event#_loading_is_started]")
-	Global.loaded = false
-
-func _loading_is_finished(_anim_name):
-	print("[Evenst#_loading_is_finished]")
-	Global.loaded = true
-
-# Events for load scene level
-####
-func _on_warcraft_pressed():
-	Global.current_scene_int = 0
-	Global.goto_scene("res://scenes/levels/warcraft/WarCraft.tscn")
-
-func _on_home_pressed():
-	Global.current_scene_int = 1
-	Global.goto_scene("res://scenes/levels/home/Home.tscn")
-	
-func _on_reset_level(level, node, index, parent):
-	Global.current_scene_int = index
-	level.reset()
-	parent.configure_reset(level, node, index, true)
-	parent.configure_counter(level, node)
-	Global.current_scene_int = null
-
-# Events for back to main scene
-####
-func _on_main_scene_pressed():
-	Global.goto_scene("res://scenes/Main.tscn")

scripts/Event.gd.uid

@@ -1 +0,0 @@
-uid://besfv1ymjgw81

scripts/Global.gd

@@ -16,8 +16,8 @@ func _ready():
 	_initialize_loading_scene()
 
 func _initialize_loading_scene():
-	animation.connect("animation_started", Callable(Event, "_loading_is_started"))
-	animation.connect("animation_finished", Callable(Event, "_loading_is_finished"))
+	animation.animation_started.connect(Event._loading_is_started)
+	animation.animation_finished.connect(Event._loading_is_finished)
 
 func goto_scene(path):
 	print("[global#goto_scene] : load scene " + str(path))

scripts/event.gd

@@ -0,0 +1,42 @@
+class_name Event
+
+# UI event handlers, namespaced as static methods so they can be wired
+# directly from anywhere without an autoload.
+#
+#   button.pressed.connect(Event._on_main_scene_pressed)
+#
+# Per-level dispatch goes through `level_pressed(name)` which maps the level
+# name to the appropriate handler.
+
+static func _loading_is_started(_anim_name: StringName) -> void:
+	Global.loaded = false
+
+static func _loading_is_finished(_anim_name: StringName) -> void:
+	Global.loaded = true
+
+static func _on_warcraft_pressed() -> void:
+	Global.current_scene_int = 0
+	Global.goto_scene("res://scenes/levels/warcraft/WarCraft.tscn")
+
+static func _on_home_pressed() -> void:
+	Global.current_scene_int = 1
+	Global.goto_scene("res://scenes/levels/home/Home.tscn")
+
+static func _on_reset_level(level, node: String, index: int, parent) -> void:
+	Global.current_scene_int = index
+	level.reset()
+	parent.configure_reset(level, node, index, true)
+	parent.configure_counter(level, node)
+	Global.current_scene_int = null
+
+static func _on_main_scene_pressed() -> void:
+	Global.goto_scene("res://scenes/Main.tscn")
+
+# Returns the press handler for a level by name (used by ChooseScene to wire
+# the dynamic level-select buttons). Returns Callable() if unknown.
+static func level_pressed(name: String) -> Callable:
+	match name.to_lower():
+		"warcraft": return _on_warcraft_pressed
+		"home": return _on_home_pressed
+	push_warning("Event.level_pressed: no handler for level '%s'" % name)
+	return Callable()

scripts/event.gd.uid

@@ -0,0 +1 @@
+uid://blq7ojhkgitwj

scripts/game_animation.gd

@@ -0,0 +1,37 @@
+class_name GameAnimation
+
+# Helpers for HUD slide/warning animations and the per-item dissolve effect.
+# Pure functions — no state — so no autoload is needed.
+
+static func level_hud_slide(node: Node) -> Animation:
+	var animation := Animation.new()
+	var track_index := animation.add_track(Animation.TYPE_BEZIER)
+	animation.track_set_path(track_index, str(node.get_path()) + ":position:x")
+	animation.bezier_track_insert_key(track_index, 0.0, 0.0, Vector2(-0.25, 0), Vector2(0.031, 190.492))
+	animation.bezier_track_insert_key(track_index, 1.0, 170, Vector2(-0.349, 2.576), Vector2(0.25, 0))
+	return animation
+
+static func level_hud_warning(node: Node) -> Animation:
+	var animation := Animation.new()
+	var track_index := animation.add_track(Animation.TYPE_BEZIER)
+	animation.track_set_path(track_index, str(node.get_path()) + ":position:x")
+	animation.bezier_track_insert_key(track_index, 0.0, 0.0, Vector2(-0.25, 0), Vector2(0, 78.1))
+	animation.bezier_track_insert_key(track_index, 0.2, 34.9, Vector2(-0.25, 0), Vector2(0, -66))
+	animation.bezier_track_insert_key(track_index, 0.4, 12.1, Vector2(0, 73.2), Vector2(0, -124.8))
+	animation.bezier_track_insert_key(track_index, 0.6, -41.9, Vector2(-0.095, 109.2), Vector2(0.062, -58.8))
+	animation.bezier_track_insert_key(track_index, 0.8, 13.3, Vector2(-0.188, 93.6), Vector2(0.196, 104.4))
+	animation.bezier_track_insert_key(track_index, 1.0, 0.0, Vector2(-0.155, -135.5), Vector2(0.25, 0))
+	return animation
+
+# Captures `material` in the tween callback so no shared mutable state is
+# needed (replaces the old `current_material` member from the autoload).
+static func start_dissolve(node: Node, material: ShaderMaterial) -> void:
+	if material == null:
+		return
+	var tween := node.create_tween()
+	tween.tween_method(
+			func(progress: float) -> void:
+				material.set_shader_parameter("dissolve_amount", ease(progress, 0.4)),
+			0.0, 1.0, 1.5) \
+		.set_trans(Tween.TRANS_LINEAR) \
+		.set_ease(Tween.EASE_IN_OUT)

scripts/game_animation.gd.uid

@@ -0,0 +1 @@
+uid://dtpgm3o6wdmju