Rarity Usage Constraints in SBC Solver

Add the ability to restrict card rarities used by the SBC Solver based on SBC requirements.

Example behavior:

• SBC requires 2 rare players

• Solver behavior:

  • Use exactly 2 rares and fill the rest with commons

• If 2 rares are not available:

  • Prompt the user with options:

    • Allow more rares

    • Change constraints

    • Cancel solve

• Else:

  • Do not automatically expand rarity usage

This prevents the solver from overusing rares and gives the user full control over constraints.