Transparent PWA icon on MacOS

[bilogic]

Is your feature request related to a problem? Please describe.
Snappymail icon has a white background and does not look as good as it can be on MacOS

Describe the solution you'd like
Use the SVG version instead of PNGs

Describe alternatives you've considered
N/A

Additional context
I have many PWAs installed, and several were able to present their icons without the white background

• https://github.com/navidrome/navidrome

• Proxmox

• Others that also look like they removed the background

  • https://github.com/silverbulletmd/silverbullet
  • HomeAssistant