Revert "Deprecate DESIGN_KW"

[jonathan-eq]

This reverts commit f67ebd5.

Issue
Resolves #my_issue

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'just rapid-tests')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Add backport label to latest release (format: 'backport release-branch-name')

[xjules]

😢

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.52%. Comparing base (58c219b) to head (f4fa3bf).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12623      +/-   ##
==========================================
- Coverage   90.54%   90.52%   -0.02%     
==========================================
  Files         435      435              
  Lines       30014    30014              
==========================================
- Hits        27175    27171       -4     
- Misses       2839     2843       +4     

Flag	Coverage Δ
cli-tests	37.27% <ø> (ø)
gui-tests	68.68% <ø> (-0.04%)	⬇️
performance-and-unit-tests	73.88% <ø> (-0.02%)	⬇️
test	38.05% <ø> (+<0.01%)	⬆️

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[codspeed-hq]

Merging this PR will not alter performance

✅ 22 untouched benchmarks

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_{Comparing jonathan-eq:revert (f4fa3bf) with main (58c219b)}