Remove AccentBar from main menu and associated animation logic. Update menu background shader to enhance starfield effect and adjust aurora band parameters for improved visual quality.

scripts/ui/main_menu.gd

@@ -18,7 +18,6 @@ const HOVER_SCALE := 1.035
 
 @onready var _saves: SaveManagerService = get_node("/root/SaveManager")
 @onready var _header: Control = $Content/Column/Header
-@onready var _accent_bar: ColorRect = $Content/Column/Header/AccentBar
 @onready var _menu: VBoxContainer = $Content/Column/Menu
 @onready var _footer: Control = $Footer
 @onready var _continue_button: Button = $Content/Column/Menu/ContinueButton
@@ -43,7 +42,6 @@ func _ready() -> void:
 	var about_back: Button = $AboutOverlay/Center/Card/Body/Actions/AboutBackButton
 	about_back.pressed.connect(_close_about)
 
-	_animate_accent_bar()
 	await _play_intro()
 	_focus_first_button()
 
@@ -168,10 +166,3 @@ func _play_intro() -> void:
 		index += 1
 
 	await tween.finished
-
-
-func _animate_accent_bar() -> void:
-	# Медленное «дыхание» акцентной черты под заголовком.
-	var tween := create_tween().set_loops().set_ease(Tween.EASE_IN_OUT).set_trans(Tween.TRANS_SINE)
-	tween.tween_property(_accent_bar, "custom_minimum_size:x", 230.0, 2.6)
-	tween.tween_property(_accent_bar, "custom_minimum_size:x", 140.0, 2.6)