* Remove ambiguity in imports - say the file extension
'less' for all instances of variables and mixins.
* Separate toast styles from drawer styles so they can be
imported separately
* associate header-action selector with its parent
(.overlay-header) not parent's parent (.overlay) so it can be imported
and rendered without the Overlay.
Change-Id: Ib7e19a440ba095d6424d35305fb41d643ca9764c
T140804 dropped the support for deviceTabletWidth in core
(https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/451648/9/includes/DefaultSettings.php)
This causes errors in these skinStyle files which are presumably not
being checked with CI.
Update these usages to use width-breakpoint-tablet instead
Bug: T202021
Change-Id: Ie804f24275c99c939687d59cca9d62204fd74518
Use local imports instead given all relevant files are within the
same repository, and don't vary by configuraion.
Bug: T140807
Depends-On: If3edac9a35b346af0320c12f70c0d978a6346201
Change-Id: Ife3cc345a63aff452e93accbe0a593fbaa358732
The mediawiki.page.gallery.styles module is only loaded
when needed, yet inside hacks.less we load gallery
styles unconditionally.
The hacks.less file is also only meant for css that overrides
template styles, so it didn't belong there anyway.
Change-Id: I4afc91ad7f67ae66544708d25541b3e8dd247873
