refactor(chat-ui): 移除HeaderContainer和SendButton，添加装饰图片，修复Enter键监听

- 删除 HeaderContainer 和 StatusLabel（状态显示）
- 删除 SendButton（发送按钮）
- 添加聊天框背景图和装饰图片
- 设置 TextureRect modulate 为白色，修复黑框问题
- 移除 ChatPanel 背景色，使背景透明
- 修复 is_key_pressed 错误，改用 InputEventKey 类型检查
- 移除 _update_connection_status 函数及相关调用

scenes/ui/ChatUI.gd

@@ -39,12 +39,6 @@ extends Control
 # 聊天输入框
 @onready var chat_input: LineEdit = %ChatInput
 
-# 发送按钮
-@onready var send_button: Button = %SendButton
-
-# 状态标签
-@onready var status_label: Label = %StatusLabel
-
 # ============================================================================
 # 预加载资源
 # ============================================================================
@@ -82,9 +76,6 @@ func _ready() -> void:
 	# 创建隐藏计时器
 	_create_hide_timer()
  
-	# 设置初始状态
-	_update_connection_status(false)
-
 	# 订阅事件（Call Down via EventSystem）
 	_subscribe_to_events()
 
@@ -111,7 +102,7 @@ func _exit_tree() -> void:
 # 处理全局输入
 func _input(event: InputEvent) -> void:
 	# 检查是否按下 Enter 键
-	if event.is_action_pressed("ui_text_submit") or event.is_key_pressed(KEY_ENTER):
+	if event is InputEventKey and event.keycode == KEY_ENTER:
 		_handle_enter_pressed()
 
 # 处理 Enter 键按下
@@ -208,9 +199,6 @@ func _on_hide_timeout() -> void:
 
 # 连接 UI 信号
 func _connect_ui_signals() -> void:
-	# 发送按钮点击
-	send_button.pressed.connect(_on_send_button_pressed)
-
 	# 输入框回车
 	chat_input.text_submitted.connect(_on_chat_input_submitted)
 
@@ -291,26 +279,10 @@ func _on_chat_error(data: Dictionary) -> void:
  
 	print("❌ ChatUI 错误: [", error_code, "] ", message)
 
-	# 显示错误消息（临时显示在状态栏）
-	status_label.text = "❌ " + message
-	status_label.modulate = Color.RED
-
-	# 3秒后恢复状态
-	var timer := get_tree().create_timer(3.0)
-	var 	timeout_callback := func():
-		_update_connection_status(ChatManager.is_chat_connected())
-	timer.timeout.connect(timeout_callback)
-
 # 处理连接状态变化
 func _on_connection_state_changed(data: Dictionary) -> void:
-	var state_names := ["DISCONNECTED", "CONNECTING", "CONNECTED", "RECONNECTING", "ERROR"]
+	# 连接状态变化处理（当前不更新UI）
-	var state: int = data.get("state", 0)
+	pass
-
-	match state:
-		2:  # CONNECTED
-			_update_connection_status(true)
-		_:
-			_update_connection_status(false)
 
 # 处理登录成功
 func _on_login_success(data: Dictionary) -> void:
@@ -349,19 +321,6 @@ func add_message_to_history(from_user: String, content: String, timestamp: float
 # 内部方法 - UI 更新
 # ============================================================================
 
-# 更新连接状态显示
-func _update_connection_status(connected: bool) -> void:
-	if connected:
-		status_label.text = "● 已连接"
-		status_label.modulate = Color.GREEN
-		chat_input.editable = true
-		send_button.disabled = false
-	else:
-		status_label.text = "○ 未连接"
-		status_label.modulate = Color.GRAY
-		chat_input.editable = false
-		send_button.disabled = true
-
 # 滚动到底部
 func _scroll_to_bottom() -> void:
 	# 等待一帧，确保 UI 更新完成

scenes/ui/ChatUI.tscn

@@ -1,9 +1,13 @@
-[gd_scene load_steps=3 format=3 uid="uid://bv7k2nan4xj8q"]
+[gd_scene load_steps=6 format=3 uid="uid://bv7k2nan4xj8q"]
 
 [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"]
+[ext_resource type="Texture2D" uid="uid://clmgyxpeh5742" path="res://assets/ui/chat/输入框背景.png" id="3_fbft8"]
+[ext_resource type="Texture2D" uid="uid://q0ijn5y0tbw3" path="res://assets/ui/chat/装饰2.png" id="4_xo31h"]
+[ext_resource type="Texture2D" uid="uid://ct0cl4h2i6ydn" path="res://assets/ui/chat/装饰.png" id="5_xlxdo"]
 
 [node name="ChatUI" type="Control"]
+unique_name_in_owner = true
 custom_minimum_size = Vector2(10, 20)
 layout_mode = 3
 anchors_preset = 15
@@ -12,18 +16,8 @@ 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
@@ -35,6 +29,15 @@ offset_top = -410.0
 offset_right = 460.0
 offset_bottom = -10.0
 grow_vertical = 0
+theme_override_styles/panel = null
+
+[node name="TextureRect" type="TextureRect" parent="ChatPanel"]
+layout_mode = 0
+offset_right = 450.0
+offset_bottom = 400.0
+texture = ExtResource("2_7dhmv")
+expand_mode = 1
+modulate = Color(1, 1, 1, 1)
 
 [node name="VBoxContainer" type="VBoxContainer" parent="ChatPanel"]
 layout_mode = 1
@@ -49,17 +52,6 @@ grow_horizontal = 2
 grow_vertical = 2
 theme_override_constants/separation = 8
 
-[node name="HeaderContainer" type="HBoxContainer" parent="ChatPanel/VBoxContainer"]
-layout_mode = 2
-
-[node name="StatusLabel" type="Label" parent="ChatPanel/VBoxContainer/HeaderContainer"]
-unique_name_in_owner = true
-layout_mode = 2
-size_flags_horizontal = 3
-theme_override_colors/font_color = Color(0.5, 0.5, 0.5, 1)
-theme_override_font_sizes/font_size = 12
-text = "○ 未连接"
-
 [node name="ChatHistory" type="ScrollContainer" parent="ChatPanel/VBoxContainer"]
 unique_name_in_owner = true
 layout_mode = 2
@@ -82,7 +74,30 @@ layout_mode = 2
 size_flags_horizontal = 3
 placeholder_text = "输入消息..."
 
-[node name="SendButton" type="Button" parent="ChatPanel/VBoxContainer/InputContainer"]
+[node name="TextureRect" type="TextureRect" parent="ChatPanel/VBoxContainer/InputContainer/ChatInput"]
-unique_name_in_owner = true
+layout_mode = 0
-layout_mode = 2
+offset_right = 435.0
-text = "发送"
+offset_bottom = 30.0
+texture = ExtResource("3_fbft8")
+expand_mode = 1
+modulate = Color(1, 1, 1, 1)
+
+[node name="TextureRect2" type="TextureRect" parent="ChatPanel"]
+layout_mode = 0
+offset_left = 10.0
+offset_top = 10.0
+offset_right = 20.0
+offset_bottom = 20.0
+texture = ExtResource("4_xo31h")
+expand_mode = 1
+modulate = Color(1, 1, 1, 1)
+
+[node name="TextureRect3" type="TextureRect" parent="ChatPanel"]
+layout_mode = 0
+offset_left = 430.0
+offset_top = 340.0
+offset_right = 440.0
+offset_bottom = 350.0
+texture = ExtResource("5_xlxdo")
+expand_mode = 1
+modulate = Color(1, 1, 1, 1)