Only building and built decks now claim owned copies, so several idea
decks can share one copy without an over-assignment warning. Deck cards
track how many copies are physically pulled: physical decks list cards
to pull with their source (a storage box, or another deck to take a copy
from), and idea decks split cards into available / in other decks / not
owned. The deck list shows status chips with to-pull counts, filters by
status, and collapses retired decks. Status and pulled counts sync,
which bumps the library document to version 4.
Existing decks migrate as ideas.
Closes#25
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>