Resolve the visual degradation issue when inverting the runner's colors.

[Kyome22]

• Replaced ICO files with 32x32 PNGs for taskbar icon resources.
• Modified the logic to keep the original alpha values and only modify the RGB components.

@mor39a This code was generated by Claude Code, so please feel free to suggest any ideas if you think there's a better way to do it.

[mor39a]

Looks good to me