fix: 修复聊天消息显示问题

- AuthScene: 修复节点路径错误 (WhaleFrame, UsernameInput)
- ChatManager: 修复 timestamp 类型转换 (String -> float)
- ChatMessage: 修复节点引用获取方式和 UI 显示
- ChatUI: 优化消息列表布局对齐

scenes/prefabs/ui/ChatMessage.gd

@@ -33,16 +33,38 @@ class_name ChatMessage
 # ============================================================================
 
 # 用户名标签
-@onready var username_label: Label = %UsernameLabel
+var username_label: Label
 
 # 时间戳标签
-@onready var timestamp_label: Label = %TimestampLabel
+var timestamp_label: Label
 
 # 内容标签
-@onready var content_label: RichTextLabel = %ContentLabel
+var content_label: RichTextLabel
 
 # 用户信息容器
-@onready var user_info_container: HBoxContainer = %UserInfoContainer
+var user_info_container: HBoxContainer
+
+# ============================================================================
+# 生命周期方法
+# ============================================================================
+
+func _ready() -> void:
+	# 使用 get_node 获取节点引用
+	username_label = get_node_or_null("VBoxContainer/UserInfoContainer/UsernameLabel")
+	timestamp_label = get_node_or_null("VBoxContainer/UserInfoContainer/TimestampLabel")
+	content_label = get_node_or_null("VBoxContainer/ContentLabel")
+	user_info_container = get_node_or_null("VBoxContainer/UserInfoContainer")
+	
+	# 调试输出
+	if username_label:
+		print("✅ UsernameLabel found")
+	else:
+		print("❌ UsernameLabel NOT found!")
+		# 打印所有子节点帮助调试
+		print("Available children: ", _get_all_children_names(self))
+	
+	# 应用最大宽度限制
+	custom_minimum_size.x = min(max_width, get_parent().size.x)
 
 # ============================================================================
 # 成员变量
@@ -51,15 +73,6 @@ class_name ChatMessage
 # 是否为自己发送的消息
 var _is_self: bool = false
 
-# ============================================================================
-# 生命周期方法
-# ============================================================================
-
-# 准备就绪
-func _ready() -> void:
-	# 应用最大宽度限制
-	custom_minimum_size.x = min(max_width, get_parent().size.x)
-
 # ============================================================================
 # 公共 API
 # ============================================================================
@@ -77,14 +90,27 @@ func _ready() -> void:
 func set_message(from_user: String, content: String, timestamp: float, is_self: bool = false) -> void:
 	_is_self = is_self
 
-	# 设置用户名
-	username_label.text = from_user
+	# 设置用户名（带空值检查）
+	if username_label:
+		username_label.text = from_user
+	else:
+		push_error("ChatMessage: username_label is null!")
+		return
 
 	# 设置内容
-	content_label.text = content
+	if content_label:
+		content_label.clear()  # 清除默认文本和所有内容
+		content_label.bbcode_text = content  # 使用 bbcode_text 因为 bbcode_enabled = true
+	else:
+		push_error("ChatMessage: content_label is null!")
+		return
 
 	# 设置时间戳
-	timestamp_label.text = _format_timestamp(timestamp)
+	if timestamp_label:
+		timestamp_label.text = _format_timestamp(timestamp)
+	else:
+		push_error("ChatMessage: timestamp_label is null!")
+		return
 
 	# 应用样式
 	_apply_style()
@@ -93,8 +119,18 @@ func set_message(from_user: String, content: String, timestamp: float, is_self:
 # 内部方法 - 样式处理
 # ============================================================================
 
-# 应用样式（自己和他人的消息不同）
+	# 应用样式（自己和他人的消息不同）
 func _apply_style() -> void:
+	if not username_label or not timestamp_label or not user_info_container:
+		return
+	
+	# 设置大小约束 - 宽度固定，高度适应内容
+	if get_parent():
+		custom_minimum_size.x = min(max_width, get_parent().size.x)
+	
+	# 重要：设置垂直 size flags 让 Panel 适应内容高度
+	size_flags_vertical = Control.SIZE_SHRINK_BEGIN
+	
 	if _is_self:
 		# 自己的消息：右侧对齐，蓝色背景
 		size_flags_horizontal = Control.SIZE_SHRINK_END
@@ -160,8 +196,16 @@ func _get_other_style() -> StyleBoxFlat:
 func _format_timestamp(timestamp: float) -> String:
 	if timestamp == 0:
 		return ""
-
+	
 	var datetime := Time.get_datetime_dict_from_unix_time(timestamp)
-
+	
 	# 格式化为 HH:MM
 	return "%02d:%02d" % [datetime.hour, datetime.minute]
+
+# 获取所有子节点名称（调试用）
+func _get_all_children_names(node: Node, _indent: int = 0) -> String:
+	var result := ""
+	for child in node.get_children():
+		result += "  ".repeat(_indent) + child.name + "\n"
+		result += _get_all_children_names(child, _indent + 1)
+	return result