Fix duplicate Difficulty type definition by importing from sudoku lib

[AdekunleBamz]

Description

Fixed duplicate Difficulty type definition by importing it from the sudoku library instead of redefining it in the types file.

Changes Made

• Modified src/types/game.ts to import Difficulty from ../lib/sudoku
• Removed the duplicate type definition
• This eliminates code duplication and ensures type consistency across the codebase

Type of Change

• Bug fix (non-breaking change)
• New feature
• Breaking change
• Documentation update

Testing

• Verified TypeScript compilation passes
• Ensured all imports and usages of Difficulty type work correctly

Additional Notes

This fix improves code maintainability by centralizing type definitions in the appropriate module.

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