fix: 修复聊天系统编译错误

- 修复 WebSocketManager/SocketIOClient 函数缩进错误
- 重命名 is_connected() 避免与 Object 基类冲突
- 修复 tscn 文件多余前导空格
- 修复测试文件 GUT 断言函数调用
- 添加 GUT 测试框架

scenes/ui/ChatUI.tscn

@@ -1,8 +1,10 @@
-[gd_scene load_steps=2 format=3 uid="uid://bv7k2m9n4xj8q"]
+[gd_scene load_steps=3 format=3 uid="uid://bv7k2nan4xj8q"]
 
-[ext_resource type="Script" path="res://scenes/ui/ChatUI.gd" id="1"]
+[ext_resource type="Script" uid="uid://pibdlvhb12q8" path="res://scenes/ui/ChatUI.gd" id="1"]
+[ext_resource type="Texture2D" uid="uid://flepo0gpb55h" path="res://assets/ui/chat/缩略框背景.png" id="2_7dhmv"]
 
 [node name="ChatUI" type="Control"]
+custom_minimum_size = Vector2(10, 20)
 layout_mode = 3
 anchors_preset = 15
 anchor_right = 1.0
@@ -10,19 +12,28 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 mouse_filter = 2
+unique_name_in_owner = true
 script = ExtResource("1")
 
+[node name="TextureRect" type="TextureRect" parent="."]
+layout_mode = 0
+offset_left = 10.0
+offset_top = 358.0
+offset_right = 460.0
+offset_bottom = 758.0
+texture = ExtResource("2_7dhmv")
+expand_mode = 1
+
 [node name="ChatPanel" type="Panel" parent="."]
 unique_name_in_owner = true
 layout_mode = 1
-anchors_preset = 3
-anchor_left = 1.0
+anchors_preset = 2
 anchor_top = 1.0
-anchor_right = 1.0
 anchor_bottom = 1.0
-offset_left = -450.0
-offset_top = -400.0
-grow_horizontal = 0
+offset_left = 10.0
+offset_top = -410.0
+offset_right = 460.0
+offset_bottom = -10.0
 grow_vertical = 0
 
 [node name="VBoxContainer" type="VBoxContainer" parent="ChatPanel"]
@@ -30,13 +41,13 @@ layout_mode = 1
 anchors_preset = 15
 anchor_right = 1.0
 anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-theme_override_constants/separation = 8
 offset_left = 10.0
 offset_top = 10.0
 offset_right = -10.0
 offset_bottom = -10.0
+grow_horizontal = 2
+grow_vertical = 2
+theme_override_constants/separation = 8
 
 [node name="HeaderContainer" type="HBoxContainer" parent="ChatPanel/VBoxContainer"]
 layout_mode = 2