fix: remove messageContextInfo from CTA buttons to fix iOS delivery

Remove messageContextInfo (deviceListMetadata) from viewOnceMessage wrapper
in generateButtonMessage and remove empty subtitle from header. This fixes
CTA mixed buttons (url, copy, call) not being delivered to iOS devices -
same pattern that fixed carousel messages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Utils/messages.ts

@@ -517,7 +517,6 @@ export const generateButtonMessage = async (
 	const hasMedia = !!(headerImage || headerVideo)
 	const header: proto.Message.InteractiveMessage.IHeader = {
 		title: hasMedia ? '' : headerTitle || '',
-		subtitle: '',
 		hasMediaAttachment: hasMedia
 	}
 
@@ -547,13 +546,10 @@ export const generateButtonMessage = async (
 	}
 
 	// Wrap in viewOnceMessage for Web/Android compatibility
+	// NOTE: messageContextInfo removed - breaks iOS delivery
 	return {
 		viewOnceMessage: {
 			message: {
-				messageContextInfo: {
-					deviceListMetadata: {},
-					deviceListMetadataVersion: 2
-				},
 				interactiveMessage
 			}
 		}