[Feature] Add opaque icon for PWA installed on iPhone/iPad devices

[KillWolfVlad]

iPhone/iPad don't support transparent icons and show ugly black background around icon. And this black background is "flashing" when app minimised. See here and here for more info.

How it looks on iPhone:

TorrServer version: MatriX.124
iOS/iPadOS version: 16.5

[tsynik]

For me, it looks OK on black. This icon was opaque and looked ugly on all Androids in pwa mode (with gradient gray square without rounded corners), so switched to transparent. Also, that background was on loading screen as not full screen square.

[KillWolfVlad]

And this black background is "flashing" when app minimised.

A black background is not as scary as flashing when minimizing.