Some issues with Special:CentralNotice and other admin pages when using Vector dark mode. All this is low priority because it's easy enough to switch back to light mode

• campaign grid
  • active campaigns totally unreadable
  • summary and submit fieldset
• campaign detail page
  • summary and submit fieldset
  • projects/languages selectors
  • geolocation selector
• banner edit page
  • summary and submit fieldset
• logs page
  • table backgrounds need removing
  • old-value red and new-value green need changing
    • see also T175842: Make CentralNotice logs easier to read
• BannerAllocation
  • looks good!