Handle case when the input template ref is falsy in the mobile header

[obulat]

Fixes

Fixes #5190 by @obulat

Description

This PR checks if the search input template ref value is not null before focusing it or setting the selection. I'm not sure when this value can be null, but Sentry does show that this can happen.

This PR also replaces the template refs in VMobileHeader with the new useTemplateRef helper.

Testing Instructions

The CI should pass

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
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• 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.

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[github-actions]

Latest k6 run output¹

     ✓ status was 200

     checks.........................: 100.00% ✓ 416      ✗ 0   
     data_received..................: 95 MB   393 kB/s
     data_sent......................: 54 kB   225 B/s
     http_req_blocked...............: avg=39.94µs  min=2.5µs    med=4.89µs   max=1.27ms p(90)=153.43µs p(95)=182.75µs
     http_req_connecting............: avg=27.33µs  min=0s       med=0s       max=1.21ms p(90)=103.44µs p(95)=131.31µs
     http_req_duration..............: avg=209.04ms min=30.44ms  med=162.18ms max=1.38s  p(90)=418.44ms p(95)=461.45ms
       { expected_response:true }...: avg=209.04ms min=30.44ms  med=162.18ms max=1.38s  p(90)=418.44ms p(95)=461.45ms
   ✓ http_req_failed................: 0.00%   ✓ 0        ✗ 416 
     http_req_receiving.............: avg=189.3µs  min=67.1µs   med=133.57µs max=6.39ms p(90)=285.59µs p(95)=324.65µs
     http_req_sending...............: avg=43.73µs  min=6.48µs   med=22.98µs  max=3.95ms p(90)=37.82µs  p(95)=44.33µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s     p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=208.81ms min=30.34ms  med=162.03ms max=1.38s  p(90)=418.1ms  p(95)=461.14ms
     http_reqs......................: 416     1.723255/s
     iteration_duration.............: avg=1.12s    min=605.15ms med=1.26s    max=2.47s  p(90)=1.45s    p(95)=1.87s   
     iterations.....................: 78      0.32311/s
     vus............................: 4       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 ↩

[krysal]

Looks good!