fix: restore focus after closing dropdown via Esc in CSS Value input

[kof]

Description

Steps for reproduction

1. focus any style value
2. type to open dropdown
3. hit ESC
4. see the input is still focused
5. hit ESC again
6. see the change is resetted

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