* fix: detect view-once media (image/video/audio) on stanza 1 for linked devices
When a view-once arrives at a linked device (InfiniteAPI), the server sends:
- Stanza 1: enc payload with full media metadata (mediaKey, directPath) wrapped in
viewOnceMessage > imageMessage/videoMessage/audioMessage with viewOnce: true
- Stanza 2: unavailable view_once fanout placeholder (already handled)
Previously only stanza 2 set key.isViewOnce = true. Stanza 1 was emitted as
plain media with no view-once indicator, making it indistinguishable from regular
media on the consumer side (messages.upsert).
This fix inspects the decrypted proto for viewOnceMessage (v1/v2/v2Ext) wrappers
containing a media message with viewOnce=true and propagates key.isViewOnce=true.
The viewOnceMessage wrapper is also used for interactive messages (carousel,
buttons, lists) but those carry interactiveMessage/listMessage inside -- never
imageMessage.viewOnce / videoMessage.viewOnce / audioMessage.viewOnce.
The distinction is unambiguous and does not affect interactive message handling.
Verified via WA Desktop
Renato Alcara
3ab578aadf