update: 修改发送消息逻辑，增加发送按钮未禁用时的输入验证

src/views/chat/ChatInterface.vue

@@ -239,7 +239,7 @@ watch(() => currentMessages.value?.map(msg => msg.respondingType), (newTypes, ol
 
 // 发送消息时滚动到底部
 const sendMessage = () => {
-  if (!messageInput.value.trim()) return
+  if (!messageInput.value.trim() && !sendButtonsDisabled.value) return
   chatStore.sendMessage(messageInput.value)
   messageInput.value = ''
   messageInputRef.value.style.height = 'auto'