Extracts all unique @{"type":"user","id":"...","name":"..."} user mentions from message. Preserves order of first appearance and deduplicates by normalized UUID.
@{"type":"user","id":"...","name":"..."}
message
Extracts all unique
@{"type":"user","id":"...","name":"..."}user mentions frommessage. Preserves order of first appearance and deduplicates by normalized UUID.