add new session button

docs/components/ai-chat-panel.md

@@ -24,7 +24,7 @@ import { AiChatPanel, useAiChat } from "timi-tdesign-mobile";
 
 const {
 	messages, isGenerating, activeToolStatus, lastError, canRetry,
-	sendMessage, stopGeneration, retryLastMessage
+	sendMessage, stopGeneration, retryLastMessage, resetConversation
 } = useAiChat({
 	request: ({ message, signal }) => fetchReply(message, signal)
 });
@@ -40,6 +40,7 @@ const {
 		@send="sendMessage"
 		@stop="stopGeneration"
 		@retry="retryLastMessage"
+		@new-conversation="resetConversation"
 	/>
 </template>
 ```
@@ -63,7 +64,7 @@ const {
 
 ## 自定义
 
-`welcome`、`composer`、`tool-status`、`message` 等插槽可以替换对应区域。`composer` 插槽会拿到 `draft`、`on-send`、`on-stop`、`on-retry` 等，便于接入自定义输入框。
+`welcome`、`composer`、`tool-status`、`message` 等插槽可以替换对应区域。`composer` 插槽会拿到 `draft`、`on-send`、`on-stop`、`on-retry`、`on-new-conversation` 等，便于接入自定义输入框。
 
 ## API