Improve dropdown widget

[hmpf]

For #1096

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.48%. Comparing base (c259f98) to head (529b835).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/argus/htmx/widgets.py	82.35%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1097      +/-   ##
==========================================
- Coverage   80.04%   79.48%   -0.56%     
==========================================
  Files         143      144       +1     
  Lines        5206     5119      -87     
==========================================
- Hits         4167     4069      -98     
- Misses       1039     1050      +11     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[podliashanyk]

Very nice! 🧑‍🍳👌
See a minor comment below.