experimental: more advanced style panel features

[kof]

Ref #4816
Closes #4874

Description

• Memorizing recent properties by instance, so that when user switches between instances and comes back they are still in-place
• alt+shift+a for advanced mode shorthand

Steps for reproduction

1. click button
2. expect xyz

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

[johnsicili]

Good except glitches we Dmd about when switching instances and style add field shows up really quickly