Fix: generate title from user message — use only text parts (#1279)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

app/(chat)/actions.ts

@@ -4,11 +4,13 @@ import { generateText, type UIMessage } from "ai";
 import { cookies } from "next/headers";
 import type { VisibilityType } from "@/components/visibility-selector";
 import { myProvider } from "@/lib/ai/providers";
+import { titlePrompt } from "@/lib/ai/prompts";
 import {
   deleteMessagesByChatIdAfterTimestamp,
   getMessageById,
   updateChatVisiblityById,
 } from "@/lib/db/queries";
+import { getTextFromMessage } from "@/lib/utils";
 
 export async function saveChatModelAsCookie(model: string) {
   const cookieStore = await cookies();
@@ -22,12 +24,8 @@ export async function generateTitleFromUserMessage({
 }) {
   const { text: title } = await generateText({
     model: myProvider.languageModel("title-model"),
-    system: `\n
-    - you will generate a short title based on the first message a user begins a conversation with
-    - ensure it is not more than 80 characters long
-    - the title should be a summary of the user's message
-    - do not use quotes or colons`,
-    prompt: JSON.stringify(message),
+    system: titlePrompt,
+    prompt: getTextFromMessage(message),
   });
 
   return title;