Track focus event instead of click to support Safari

[dhruvkb]

Fixes

Fixes #5215 by @fcoveram

Description

This PR changes the theme selector to listen on the focus event on the <select> field instead of click so that bug in Safari can be mitigated.

Testing Instructions

0. Verify that the bug cannot be reproduced in Safari.
1. Verify that the behaviour in other browsers like Firefox and Chrome hasn't changed.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

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[github-actions]

Latest k6 run output¹

     ✓ status was 200

     checks.........................: 100.00% ✓ 414      ✗ 0   
     data_received..................: 97 MB   401 kB/s
     data_sent......................: 54 kB   224 B/s
     http_req_blocked...............: avg=72µs     min=2.39µs   med=4.78µs   max=1.28ms   p(90)=137.96µs p(95)=612.71µs
     http_req_connecting............: avg=53.38µs  min=0s       med=0s       max=1.23ms   p(90)=96.28µs  p(95)=174.93µs
     http_req_duration..............: avg=194.74ms min=30.93ms  med=153.77ms max=715.77ms p(90)=378.69ms p(95)=431.24ms
       { expected_response:true }...: avg=194.74ms min=30.93ms  med=153.77ms max=715.77ms p(90)=378.69ms p(95)=431.24ms
   ✓ http_req_failed................: 0.00%   ✓ 0        ✗ 414 
     http_req_receiving.............: avg=165.99µs min=46.98µs  med=142.01µs max=628.21µs p(90)=275.95µs p(95)=324.65µs
     http_req_sending...............: avg=27.29µs  min=9.44µs   med=22.04µs  max=129.36µs p(90)=43.45µs  p(95)=74.62µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=194.54ms min=30.78ms  med=153.61ms max=715.3ms  p(90)=378.2ms  p(95)=430.91ms
     http_reqs......................: 414     1.716084/s
     iteration_duration.............: avg=1.05s    min=550.91ms med=1.2s     max=2.02s    p(90)=1.37s    p(95)=1.4s    
     iterations.....................: 77      0.319175/s
     vus............................: 3       min=0      max=6 
     vus_max........................: 60      min=60     max=60

Footnotes

1. This comment will automatically update with new output each time k6 runs for this PR ↩

[obulat]

Nice and simple fix!