chore: cherry-pick accessibility improvements to the release branch [WPB-23860]

[V-Gira]

WPB-23860 [Web] Prep Bund release based on Web Production release 2026-01-28-production.0

Pull Request

Summary

• What did I change and why?
• Risks and how to roll out / roll back (e.g. feature flags):

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Security Checklist (required)

• External inputs are validated & sanitized on client and/or server where applicable.
• API responses are validated; unexpected shapes are handled safely (fallbacks or errors).
• No unsafe HTML is rendered; if unavoidable, sanitization is applied and documented where it happens.
• Injection risks (XSS/SQL/command) are prevented via safe APIs and/or escaping.

Accessibility (required)

• I have read and this PR upholds our Accessibility Best Practices.

Standards Acknowledgement (required)

• I have read and this PR upholds our Coding Standards and Tech Radar Choices.

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Screenshots or demo (if the user interface changed)

Notes for reviewers

• Trade-offs:
• Follow-ups (linked issues):
• Linked PRs (e.g. web-packages):

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/q1-2026@c354355). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ents/MessagesList/Message/EphemeralTimer.styles.ts	75.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##             release/q1-2026   #20574   +/-   ##
==================================================
  Coverage                   ?   45.23%           
==================================================
  Files                      ?     1632           
  Lines                      ?    40241           
  Branches                   ?     8316           
==================================================
  Hits                       ?    18205           
  Misses                     ?    20109           
  Partials                   ?     1927           

Flag	Coverage Δ
app_webapp	43.40% <83.33%> (?)
lib_api_client	50.27% <ø> (?)
lib_core	58.90% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...components/MessagesList/Message/EphemeralTimer.tsx	100.00% <100.00%> (ø)
...webapp/src/script/components/TitleBar/TitleBar.tsx	62.13% <100.00%> (ø)
...ents/MessagesList/Message/EphemeralTimer.styles.ts	75.00% <75.00%> (ø)

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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