feat: implement new Baileys features including PTV messages, poll decryption, and channel fetching

src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts

@@ -2244,23 +2244,12 @@ export class BaileysStartupService extends ChannelStartupService {
 
       const image = previewData.images && previewData.images.length > 0 ? previewData.images[0] : undefined;
 
-      let thumbnail: Buffer | undefined = undefined;
-      if (image) {
-        try {
-          const response = await axios.get(image, { responseType: 'arraybuffer' });
-          thumbnail = Buffer.from(response.data);
-        } catch {
-          // Ignore image fetch failures
-        }
-      }
-
       return {
         externalAdReply: {
           title: previewData.title,
           body: previewData.description,
-          mediaType: 1, // 1 for image, 2 for video. Using 1 for better cover image support with renderLargerThumbnail
+          mediaType: 2, // 2 for video/image preview, though usually 1 is for thumbnail
           thumbnailUrl: image,
-          thumbnail: thumbnail,
           sourceUrl: url,
           mediaUrl: url,
           renderLargerThumbnail: true