Create a Travel-sized Deck

**Is your feature request related to a problem? Please describe.**
Travelling with card decks is always more complicated than it needs to be. The deck always gets a raised eyebrow from airport security given the shape and density.

**Describe the solution you'd like**
A pocketable deck sized would be perfect. It would not be in your luggage but in your pocket, easily removed from travel and being in your pocket it would more likely be pulled out and used during your travel as well!

Deck dimensions: 3.43 x 1.26 inches (87 x 32mm)

**Describe alternatives you've considered**
Phone only version - but that means having connectivity all the time.

**Additional context**
The inspiration for this is actually the Air Deck https://onebagtravels.com/air-deck-playing-cards-3-0/

Start by reviewing how the existing Cornucopia decks are represented and built; this issue names no files, tests, or entry points. Compare the current deck output with the requested 3.43 x 1.26 inch (87 x 32mm) dimensions and the linked Air Deck reference, then clarify the required source and production changes before implementation.

Written by the indexing model from the issue text.