fix(insights): align call history empty state with search bar

[KartikLabhshetwar]

What does this PR do?

• Fixes Call history empty state container misaligned with search bar #25717
• Fixes CAL-6888

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Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Aligned the Call History empty state with the search bar in Insights by removing the padding wrapper around EmptyScreen. Fixes the misaligned container so width and spacing match the search bar, per Linear CAL-6888.

^{Written for commit a89e11b. Summary will update automatically on new commits.}

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