fix：修复重连状态与认证流程关键缺陷

scenes/ui/AuthScene.gd

@@ -91,6 +91,7 @@ var toast_manager: ToastManager
 
 # 验证码冷却计时器
 var cooldown_timer: Timer = null
+var cooldown_email: String = ""
 
 # 当前登录模式（从管理器同步）
 var current_login_mode: AuthManager.LoginMode = AuthManager.LoginMode.PASSWORD
@@ -291,9 +292,6 @@ func _on_register_pressed():
 func _on_send_code_pressed():
 	var email = register_email.text.strip_edges()
 	auth_manager.send_email_verification_code(email)
-	
-	# 开始冷却计时器
-	_start_cooldown_timer(email)
 
 # 获取登录验证码按钮
 func _on_get_login_code_pressed():
@@ -374,8 +372,10 @@ func _on_controller_register_failed(_message: String):
 
 # 验证码发送成功处理
 func _on_controller_verification_code_sent(_message: String):
-	# 验证码发送成功，冷却计时器已经在按钮点击时启动
-	pass
+	var email = auth_manager.current_email
+	if email == "":
+		email = register_email.text.strip_edges()
+	_start_cooldown_timer(email)
 
 # 验证码发送失败处理
 func _on_controller_verification_code_failed(_message: String):
@@ -429,12 +429,20 @@ func _on_controller_show_toast_message(message: String, is_success: bool):
 # ============ 验证码冷却管理 ============
 
 # 开始冷却计时器
-func _start_cooldown_timer(_email: String):
+func _start_cooldown_timer(email: String):
 	if cooldown_timer != null:
 		cooldown_timer.queue_free()
+		cooldown_timer = null
+
+	cooldown_email = email
+	if cooldown_email == "":
+		cooldown_email = register_email.text.strip_edges()
 	
 	send_code_btn.disabled = true
-	send_code_btn.text = "重新发送(60)"
+	var remaining_time = auth_manager.get_remaining_cooldown_time(cooldown_email)
+	if remaining_time <= 0:
+		remaining_time = 60
+	send_code_btn.text = "重新发送(%d)" % remaining_time
 	
 	cooldown_timer = Timer.new()
 	add_child(cooldown_timer)
@@ -444,7 +452,8 @@ func _start_cooldown_timer(_email: String):
 
 # 冷却计时器超时处理
 func _on_cooldown_timer_timeout():
-	var remaining_time = auth_manager.get_remaining_cooldown_time(register_email.text.strip_edges())
+	var email = cooldown_email if cooldown_email != "" else register_email.text.strip_edges()
+	var remaining_time = auth_manager.get_remaining_cooldown_time(email)
 	
 	if remaining_time > 0:
 		send_code_btn.text = "重新发送(%d)" % remaining_time
@@ -462,6 +471,7 @@ func _reset_verification_button():
 		cooldown_timer.queue_free()
 		cooldown_timer = null
 	
+	cooldown_email = ""
 	send_code_btn.disabled = false
 	send_code_btn.text = "发送验证码"