fix(cluster-logs): remove gap between scroll controls

[TheoGrandin74]

Summary

• group the cluster deployment-log scroll controls with zero gap
• remove the extra margin that separated the joined buttons
• add a regression test for the control layout

Validation

• Prettier: passed
• ESLint: passed
• Jest: blocked before execution because the local install is missing declared dependency @radix-ui/react-switch

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Summary by cubic

Removes the gap between the cluster log scroll up and down buttons so they render as a single joined control instead of two separated buttons.

• Groups both buttons in a flex container with zero gap.
• Removes the extra margin that separated the scroll down button.
• Adds a regression test asserting the scroll controls have no gap.

^{Written for commit 1e20cda. Summary will update on new commits.}

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 1e20cda

Command	Status	Duration	Result
nx run console:build --parallel=3 --configurati...	✅ Succeeded	1m 7s	View ↗
nx affected --target=test --parallel=3 --config...	✅ Succeeded	2m 57s	View ↗
nx affected --target=lint --parallel=3	✅ Succeeded	2m 34s	View ↗
nx-cloud record -- yarn nx format:check	✅ Succeeded	5s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-08-27 15:31:17 UTC

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.38%. Comparing base (154489f) to head (1e20cda).
⚠️ Report is 2 commits behind head on staging.

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2913      +/-   ##
===========================================
+ Coverage    48.52%   49.38%   +0.85%     
===========================================
  Files         1300      831     -469     
  Lines        28045    20866    -7179     
  Branches      8193     6353    -1840     
===========================================
- Hits         13608    10304    -3304     
+ Misses       12140     8784    -3356     
+ Partials      2297     1778     -519     

Flag	Coverage Δ
unittests	49.38% <100.00%> (+0.85%)	⬆️

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