fix: Fix add style input focus when pressing + button

[kof]

Steps for reproduction

1. go to advanced
2. click + button - focus should happen
3. click again - it will quickly disappear and appear focused again - this is expected
4. hit enter or tab on recently added value - input will appear focused

Code Review

• hi @kof, I need you to do
  • conceptual review (architecture, feature-correctness)
  • detailed review (read every line)
  • test it on preview

Before requesting a review

• made a self-review
• added inline comments where things may be not obvious (the "why", not "what")

Before merging

• tested locally and on preview environment (preview dev login: 0000)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env file