20260524 update

1. Fixed music loading and playback issues: Improved MIDI music detection, loading, and playback handling. This reduces the chance of invalid playback behavior when MIDI support is unavailable or when music files fail to load correctly.
2. Fixed a Steam achievement constant: Corrected the achievement constant for CUM_DEAD_1000, preventing the wrong achievement from being checked or unlocked when death-count progress is updated.
3. Fixed Steam leaderboard handling: Improved leaderboard handle validation and recovery. Leaderboards should now load, display, and update more reliably when Steam fails to return a valid leaderboard handle on the first attempt.
4. Fixed line-adding logic: Corrected edge cases in the new-line generation process, including situations related to Relax Mode, mask rows, and automatic line updates after mine triggers or full-grid events.
5. Fixed graphics resource cleanup: Corrected bitmap and device context release logic to prevent resource leaks and improve stability when loading, resizing, or refreshing game graphics.
6. Fixed board mouse input handling: Improved mouse event handling on the game board, reducing the chance of incorrect clicks or invalid board interactions.
7. Fixed tutorial data: Corrected tutorial array values to prevent incorrect tutorial steps, misplaced hints, or unexpected tutorial behavior.