Add unit tests for action value formatting and distribution

- Implemented a new test script `test_action_values.gd` to verify the precision of fractional action amounts and the distinctiveness of adjacent values.
- Added checks to ensure that action values are correctly formatted and that the distribution of actions preserves distinct requests.
- Included validation for rendered button labels to confirm they are distinguishable.

world/world.tscn

@@ -42,9 +42,25 @@
 [ext_resource type="Texture2D" uid="uid://bwqmmmg6w7dho" path="res://ui/indicators/trends/trend_icon_4.png" id="39_jms70"]
 [ext_resource type="Texture2D" uid="uid://4tpbmpe6tbk0" path="res://ui/indicators/trends/trend_bar5.png" id="40_50rdj"]
 [ext_resource type="Texture2D" uid="uid://cnf3ml5gj2cvl" path="res://ui/indicators/trends/trend_icon_5.png" id="41_mi6gc"]
+[ext_resource type="Texture2D" uid="uid://drcoll8tlms5s" path="res://main_menu/Owniverse.png" id="43_58wjt"]
+[ext_resource type="Texture2D" uid="uid://dcpavg1u7gne7" path="res://main_menu/en/CreateUniverse.png" id="43_k83x5"]
+[ext_resource type="Texture2D" uid="uid://c7osivfr1yusc" path="res://main_menu/en/Tutorial.png" id="44_b8tmp"]
+[ext_resource type="Texture2D" uid="uid://cq3ho84qxa2wj" path="res://main_menu/en/Achievements.png" id="45_vu62d"]
+[ext_resource type="Texture2D" uid="uid://clifqlkiqlp7s" path="res://main_menu/en/Russian.png" id="46_58wjt"]
+[ext_resource type="Texture2D" uid="uid://bp7fwgt6kwnwa" path="res://main_menu/ru/English.png" id="47_bfrib"]
+[ext_resource type="Texture2D" uid="uid://c15y3813cpwtd" path="res://main_menu/en/SoundNonActive.png" id="47_dp8ul"]
+[ext_resource type="Texture2D" uid="uid://cj0qbxoddsnjv" path="res://main_menu/en/EnglishActive.png" id="48_mip0j"]
+[ext_resource type="Texture2D" uid="uid://cbpds0flysd4i" path="res://main_menu/en/SoundActive.png" id="48_o7xkw"]
+[ext_resource type="Texture2D" uid="uid://dxh4l2ovvmrk1" path="res://main_menu/en/MusicNonActive.png" id="49_bfrib"]
+[ext_resource type="Texture2D" uid="uid://so06vth6le3b" path="res://main_menu/ru/RussianActive.png" id="50_l6135"]
+[ext_resource type="Texture2D" uid="uid://bamh6ko30ljb7" path="res://main_menu/en/MusicActive.png" id="50_mip0j"]
+[ext_resource type="Texture2D" uid="uid://bhfva6xtyij4k" path="res://main_menu/en/Credits.png" id="51_l6135"]
+[ext_resource type="Texture2D" uid="uid://dwqpcm1pryw44" path="res://main_menu/en/LeaveReality.png" id="52_uvuuk"]
 
 [sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_ifjjt"]
 
+[sub_resource type="ButtonGroup" id="ButtonGroup_58wjt"]
+
 [node name="World" type="Node2D" unique_id=1392592456]
 
 [node name="Background" type="Node2D" parent="." unique_id=1988758765]
@@ -868,6 +884,90 @@ theme_override_styles/panel = SubResource("StyleBoxEmpty_ifjjt")
 [node name="Border" parent="Stage/StageRows" unique_id=145801370 instance=ExtResource("12_58wjt")]
 layout_mode = 2
 
+[node name="MainMenu" type="VBoxContainer" parent="Stage" unique_id=731440017]
+visible = false
+layout_mode = 0
+offset_right = 40.0
+offset_bottom = 40.0
+theme_override_constants/separation = 32
+
+[node name="TopMenu" type="HBoxContainer" parent="Stage/MainMenu" unique_id=252548655]
+layout_mode = 2
+
+[node name="BurgerButton" type="TextureButton" parent="Stage/MainMenu/TopMenu" unique_id=1685450387]
+custom_minimum_size = Vector2(128, 128)
+layout_mode = 2
+size_flags_horizontal = 4
+size_flags_vertical = 4
+texture_normal = ExtResource("4_b8tmp")
+texture_pressed = ExtResource("5_en1oy")
+
+[node name="Logo" type="TextureRect" parent="Stage/MainMenu" unique_id=1181845167]
+custom_minimum_size = Vector2(1080, 256)
+layout_mode = 2
+texture = ExtResource("43_58wjt")
+
+[node name="CreateOwniverse" type="TextureButton" parent="Stage/MainMenu" unique_id=1568939047]
+custom_minimum_size = Vector2(1024, 128)
+layout_mode = 2
+texture_normal = ExtResource("43_k83x5")
+
+[node name="Tutorial" type="TextureButton" parent="Stage/MainMenu" unique_id=663512289]
+custom_minimum_size = Vector2(1024, 128)
+layout_mode = 2
+texture_normal = ExtResource("44_b8tmp")
+
+[node name="Achievements" type="TextureButton" parent="Stage/MainMenu" unique_id=141361251]
+custom_minimum_size = Vector2(1024, 128)
+layout_mode = 2
+texture_normal = ExtResource("45_vu62d")
+
+[node name="Language" type="HBoxContainer" parent="Stage/MainMenu" unique_id=2100638475]
+layout_mode = 2
+
+[node name="English" type="TextureButton" parent="Stage/MainMenu/Language" unique_id=1495557975]
+custom_minimum_size = Vector2(512, 128)
+layout_mode = 2
+toggle_mode = true
+button_group = SubResource("ButtonGroup_58wjt")
+texture_normal = ExtResource("47_bfrib")
+texture_pressed = ExtResource("48_mip0j")
+
+[node name="Russian" type="TextureButton" parent="Stage/MainMenu/Language" unique_id=2024992008]
+custom_minimum_size = Vector2(512, 128)
+layout_mode = 2
+toggle_mode = true
+button_group = SubResource("ButtonGroup_58wjt")
+texture_normal = ExtResource("46_58wjt")
+texture_pressed = ExtResource("50_l6135")
+
+[node name="Media" type="HBoxContainer" parent="Stage/MainMenu" unique_id=583896501]
+layout_mode = 2
+
+[node name="Sound" type="TextureButton" parent="Stage/MainMenu/Media" unique_id=116977198]
+custom_minimum_size = Vector2(512, 128)
+layout_mode = 2
+toggle_mode = true
+texture_normal = ExtResource("47_dp8ul")
+texture_pressed = ExtResource("48_o7xkw")
+
+[node name="Music" type="TextureButton" parent="Stage/MainMenu/Media" unique_id=953224171]
+custom_minimum_size = Vector2(512, 128)
+layout_mode = 2
+toggle_mode = true
+texture_normal = ExtResource("49_bfrib")
+texture_pressed = ExtResource("50_mip0j")
+
+[node name="Credits" type="TextureButton" parent="Stage/MainMenu" unique_id=44726060]
+custom_minimum_size = Vector2(1024, 128)
+layout_mode = 2
+texture_normal = ExtResource("51_l6135")
+
+[node name="LeaveReality" type="TextureButton" parent="Stage/MainMenu" unique_id=2139602731]
+custom_minimum_size = Vector2(1024, 128)
+layout_mode = 2
+texture_normal = ExtResource("52_uvuuk")
+
 [node name="ItemAmountUpdate" type="Timer" parent="Stage" unique_id=1953928024]
 wait_time = 0.2
 autostart = true