12787 resizable testing feedback changes

[Jondyr]

Description

Changes based on testing feedback:

• Removed the hover effect on handles
• Added a minimum size (250px) to center panels
• Added flex-wrap: wrap to editgrid tabs and overflow-x: auto on property panels to prevent content overflow
• Set the preview to open by default
• Made collapsed panels persistent in local storage

Additional changes:

• Added throttling to resizing to calculate new container sizes only once per render cycle.
  Renders taking longer than usual might have multiple mousemove events fired, resulting in the code trying to calculate new sizes for the elements before the last resizing operation finished. This overwrote the last calculation and caused a clunky dragging feel.
• Minor code structure refactoring

Related Issue(s)

• It should be possible to adjust the sizes of the panels by dragging them narrower or wider #12787

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.04%. Comparing base (1651068) to head (d7c2f3c).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13154      +/-   ##
==========================================
- Coverage   92.16%   86.04%   -6.12%     
==========================================
  Files        1443       16    -1427     
  Lines       20302      473   -19829     
  Branches     2432       41    -2391     
==========================================
- Hits        18711      407   -18304     
+ Misses       1326       62    -1264     
+ Partials      265        4     -261     

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[ErlingHauan]

Looks good to me 😊
Good minimum size for the center columns 👍

[standeren]

Nice! 🤩
Small comment on the grid tab only