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

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

lib/ai/prompts.ts

@@ -112,3 +112,9 @@ export const updateDocumentPrompt = (
 
 ${currentContent}`;
 };
+
+export const titlePrompt = `\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`

lib/utils.ts

@@ -108,9 +108,9 @@ export function convertToUIMessages(messages: DBMessage[]): ChatMessage[] {
   }));
 }
 
-export function getTextFromMessage(message: ChatMessage): string {
+export function getTextFromMessage(message: ChatMessage | UIMessage): string {
   return message.parts
     .filter((part) => part.type === 'text')
-    .map((part) => part.text)
+    .map((part) => (part as { type: 'text'; text: string}).text)
     .join('');
 }