Generates a short-lived signed share link for the display's CURRENT content. This is the ONLY supported way to share what's on the screen — the legacy permanent public viewer URL has been removed for GDPR compliance. Use this when the user wants to send what the screen is showing to a colleague, embed it in a chat or document, or hand it to an external integration. The returned previewUrl is read-only, expires after ttl_seconds, and dies the moment the owner pushes new content. The TTL ceiling depends on the display's privacy_mode: 'Private' caps at 3600s; 'Public' caps at 86400s. Requested TTLs above the per-mode ceiling are silently clamped; the returned ttlSeconds reflects the actual lifetime. Recipients see the display's content framed in a preview chrome — they cannot push, configure, or discover other displays. Requires content_only scope.
Connector