feat(send): embed JPEG thumbnail in image messages#88
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WhatsApp renders the gray/green camera placeholder for ImageMessages sent without a JPEGThumbnail, only showing the picture after a manual download. This affects /send/media for both regular chats and newsletters (channels). Generate a small (~72px) JPEG preview from the source bytes and set it on ImageMessage.JPEGThumbnail across all media image paths (sendMediaFileWithRetry, sendMediaUrlWithRetry, sendStatusMedia) so the usual blurred inline preview is shown. Generation failures degrade gracefully: the message is still sent, just without the inline preview. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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WhatsApp renders the gray/green camera placeholder for ImageMessages sent without a JPEGThumbnail, only showing the picture after a manual download. This affects /send/media for both regular chats and newsletters (channels).
Generate a small (~72px) JPEG preview from the source bytes and set it on ImageMessage.JPEGThumbnail across all media image paths (sendMediaFileWithRetry, sendMediaUrlWithRetry, sendStatusMedia) so the usual blurred inline preview is shown. Generation failures degrade gracefully: the message is still sent, just without the inline preview.
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