This PR makes all header buttons injectable

[ClaudeArs]

Summary of Changes

This PR makes all header buttons injectable

Screenshots, videos, or gifs

N/A

Breaking change guide

Replace this text with any breaking changes included in this PR along with how to address them in downstream projects. If there are none, simply enter N/A

Related Issues

Replace this text with issue #'s that are relevant to this PR. If there are none, simply enter N/A

Pull Request Checklist

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• All commits contain a DCO Signed-off-by line (we use the DCO GitHub app to enforce this)
• If applicable, screenshots, gifs, or video are included for UI changes
• If applicable, breaking changes are described above along with how to address them
• Updated documentation as needed for changed code and new or modified features
• Added sufficient tests so that overall code coverage is not reduced

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[sonarcloud]

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