fix(serial): move ^SN before ^FD per ZPL spec#20
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^SN must precede ^FD within the same field definition, identical to ^SF. Previous output placed ^SN as a standalone command after ^FS, which caused Zebra printers to ignore serialization and print the same value on all copies.
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^SN must precede ^FD within the same field definition, identical to ^SF. Previous output placed ^SN as a standalone command after ^FS, which caused Zebra printers to ignore serialization and print the same value on all copies.