feat: added visual hint when copied level code

ROADMAP.md

@@ -71,7 +71,7 @@ Secondary mechanics are:
 | TOTAL | ----- | ------ | ------ | ----- |     29   |
 
 
-- [ ] Add hint when copied level code;
+- [x] Add hint when copied level code;
 - [x] Disable save button when name or code is missing in import window;
 - [x] Update level interface when importing a level;
 - [x] Duplicate inspection panel for normal/custom levels;

assets/ui/paste_check_icon.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bre7mikpnncf"
+path="res://.godot/imported/paste_check_icon.png-88ccdc01eb1267b185eb2cc0ba130c89.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/ui/paste_check_icon.png"
+dest_files=["res://.godot/imported/paste_check_icon.png-88ccdc01eb1267b185eb2cc0ba130c89.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

scripts/user_interface/custom_level_inspect.gd

@@ -6,6 +6,7 @@ const LEVEL_BUILDER = preload("res://packed_scene/scene_2d/LevelBuilder.tscn")
 const BUILDER_UI = preload("res://packed_scene/user_interface/BuilderUI.tscn")
 const LEVEL_MANAGER = preload("res://packed_scene/scene_2d/LevelManager.tscn")
 const GAME_UI = preload("res://packed_scene/user_interface/GameUI.tscn")
+const PASTE_CHECK_ICON = preload("res://assets/ui/paste_check_icon.png")
 
 var _level_name: String
 var _level_code: String
@@ -96,6 +97,8 @@ func _on_background_gui_input(event: InputEvent) -> void:
 
 func _on_copy_btn_pressed() -> void:
 	DisplayServer.clipboard_set(_level_code)
+	copy_btn.icon = PASTE_CHECK_ICON
+	copy_btn.add_theme_color_override("icon_normal_color", Color.WEB_GREEN)
 
 
 func _on_delete_btn_pressed() -> void:

scripts/user_interface/level_import.gd

@@ -1,6 +1,7 @@
 extends Control
 
 const BUTTON_ERROR = preload("res://assets/resources/themes/button_error.tres")
+
 var _inserted_code: String
 
 @onready var code: Button = %Code