Multi-Colum zoom issue on mobile as PWA when adding lists

[DismalShadowX]

Fixed misaligned viewpoint width on columns being too narrow when using Multi-Column on mobiles. This also improves better readability on desktop too. By default zoom on both Chrome for PC and Android is set to 100%.

See: #https://github.com/DismalShadowX/phanpy/pull/1

I have marked this as draft PR to ensure the commit is reasonable compromise or open to discussion.

While width also affect especially desktop with 100% zoom, as a PWA in its own, I have zoom set to 80% for desktop due to 1920x1080 and 2560x1440 resolution. Chrome on Android is set 100% zoom as is.

Demo