Fix input/textarea focus border color in dark theme

[js0mmer]

Description

• forces border color to be blue on focus
  • i'd argue this is an ok usage of !important, I don't want to find every place where the border-color is redefined and redefine the focus color, and that's not something we want to have to remember to do in the future either
• additionally, fixed checkbox border color to match with inputs (as seen in the last row of images)

Screenshots

before	after

Steps to verify/test this change:

• Verify changes work as expected on staging instance

Final Checks:

• Verify successful deployment

(optional)

• Write tests
• Write documentation

Issues

Closes #