Adding many new mini-games and practice games to improve different skills.

Eval var behaves better.

- Launch notation practice, timed notation, square recognition, and instructions from a premium visual home screen. - Browse the game library with thumbnail board previews for each game. - Filter by level and opening, or search by title, players, opening, or difficulty. - Start a random game from the filtered library. - Train move-by-move with SAN input, hints, reveal, evaluation context, and results. - Play timed notation sessions with selectable duration, remaining-time display, timeout handling, and timed results. - Practice square recognition by tapping prompted coordinates with bonus or strict timing variants. - Review square-recognition results history stored on device. - Customize board coordinates, per-difficulty evaluation visibility, and board style. - Render boards with bundled transparent chess-piece artwork and selectable visual themes: Current, Marble, Wood, and Metal.

Improved move entry with a custom chess notation keyboard. This update adds dedicated keys for pieces, files, ranks, captures, castling, checks, checkmates, and promotions, so you no longer need to rely on the standard system keyboard while training. The training screen has also been refined with clearer progress and attempt information, plus general polish for a smoother learning flow.