Adds a numeric-input modal (PlayBySeedPlugin) that lets the player type
a decimal seed and receive an instant solver-verified verdict before the
hand is dealt. A new HomeMode::PlayBySeed card surfaces it in the home
overlay, matched by the StartPlayBySeedRequestEvent carrier.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300