fix: checkout helper logic

[DaniilSyzenko]

Changes checkout helper logic.

• Removes impossible checkout suggestions like "D22" (it doesn't exist on the board)
• Improves suggestion logic to prioritize more practical combinations, e.g., "D15, T19" instead of "T10, T19" because triples are
• Removes unnecessary checks for triple bull, as isValidSector already returns null for rawValue > 20