fix: simplify refusal handling in message response by removing is-refusal field

supabase/functions/create-chat-conversation/index.ts

@@ -378,12 +378,15 @@ app.post(`${prefix}/conversations/:id/messages`, async (c) => {
     });
 
     const respuestaJSON = JSON.parse(resp.output_text ?? "{}");
+    const refusal = respuestaJSON["is-refusal"] === true;
+    //remove the is-refusal field from respuestaJSON to avoid confusion
+    delete respuestaJSON["is-refusal"];
 
     // Now an item with the assistant response and the structured data (if any) should be
     appended = {
       timestamp: new Date().toISOString(),
       user: "assistant",
-      refusal: resp.output_text === "refusal",
+      refusal,
       // the ai-message field is the response
       message: respuestaJSON?.["ai-message"] ?? "",
       recommendations: resp.output_text