[Research] OUI Compliance audit of src/core/public/core_app

[BSFishy]

Tracking issue for OUI compliance audit of the src/core/public/core_app folder.

Follow the steps in #3945 to complete the audit, then open another issue with findings. Once the work of performing the audit is done, this issue can be closed.

Note that this is a core service, which may be involved with the implementation and inclusion of OUI styles and themes. Since this is a core service, the conclusion of this audit might actually not involve any additional work.

Related files

size (bytes)	file	notes
2.6K	src/core/public/core_app/styles/_mixins.scss
272	src/core/public/core_app/styles/_globals_v8light.scss
269	src/core/public/core_app/styles/_globals_v8dark.scss
232	src/core/public/core_app/styles/_globals_v7light.scss
229	src/core/public/core_app/styles/_globals_v7dark.scss

If this issue isn't already assigned to someone and you'd like to take on this work, please ping @BSFishy in the comments and I can assign it to you.