The virtual tabletop as one object: stage geometry, the Pixi canvas, seats, and the multiplayer client that pairs with cardcarp-relay. No UI — an app brings its own.

The deckbox's state and logic: filters and facets, deck editing, import, odds and print layout. No UI — an app brings its own.

What a deckbox and a table both need: the game store, the shared UI state, and the card-shaped helpers neither owns.