What changed
- Choose an exact raise-to amount with presets, a slider, or direct input.
- Added Min, 1/2 Pot, 3/4 Pot, Pot, and Max shortcuts.
- Enforced legal minimum/full-raise and maximum all-in boundaries in the game engine.
- Added coverage for legal and invalid explicit raise sizes.
Validated with typecheck, 17 engine tests, production build, and browser QA.