Replacing 'mediawiki.ui/variables.less' @import with
new skin-aware 'mediawiki.skin.variables.less' standard.
Removing calls for 'mediawiki.skin.variables.less' in favor for
'minerva.variables.less' for consistency.
Also
- replacing several static values with new Codex design token featuring
skin variables of `background-color`, `color`, `border-*` and
`transition` categories
- renaming several Less variables to variable naming standard
- moving a small number of MinervaNeue specific variables into
'minderva.variables.less' file. Those should be replaced in mid-future
by Codex design tokens
Please note, that this patch is not replacing all values with
possible Codex tokens. It's just applying them on selected
categories for consistency for now to keep the patch easier reviewable.
Further replacements will be done in follow-up patches.
Bump MediaWiki core required version to >= v1.41.0.
Bug: T319381
Bug: T332541
Depends-On: I98c8cc27527533e2efb3b987ee34bc403e988b75
Change-Id: I86c5a35377541a784552c29456e0b8b507b3ee9c
`lazy-image-placeholder` is needed only when MobileFrontend is enabled.
So it makes sense to move those styles to mobile.init css. See more details here: T199351#6380240
Bug: T260406
Change-Id: I16ca734af33fb0f3c4c67f20bbca8631279d7778
