Third-party deck tools (e.g. Delver Lens) export decks as tab-separated rows
such as "2 Card Name Set Name". Card names never contain tab characters,
so a leading numeric column marks a tabular record: the first two columns are read
as the quantity and card name, and any further columns are discarded as
printer/set metadata.
- deck_list: parse tab-delimited rows before whitespace collapsing
- tests: cover tab-separated mainboard and sideboard imports
- docs: document the accepted plain-text import format (fills the TODO)
Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
