Bring MinervaNeue & MobileFrontend error/warning/success messages/message box visual appearance close to Style Guide components template.
Originated in T127405 with current treatment is off template and has too low contrast accessibility issues
Proposed unified colors
Applying Style Guide definitions of message boxes:
Steps to accomplish
- Both, MinervaNeue & MobileFrontend are currently importing mediawiki.ui variables and define their own. Let's remove special overrides and just references mediawiki.ui vars until MN/MF gets independent from it. Defining in 3 places makes 0 sense
- Align only colors and borders for now, padding seems contextual. Can revisit in a box unification at a later point