save model id on messages

app/src/chat-manager.ts

@@ -126,6 +126,7 @@ export class ChatManager extends EventEmitter {
             chatID: latestMessage.chatID,
             timestamp: Date.now(),
             role: 'assistant',
+            model: requestedParameters.model,
             content: '',
             done: false,
         };

app/src/types.ts

@@ -13,6 +13,7 @@ export interface Message {
     parentID?: string;
     timestamp: number;
     role: string;
+    model?: string;
     content: string;
     parameters?: Parameters;
     done?: boolean;