fix: correct line-height and hamburger overlay on mobile/large screens

[DatGreekChick]

Summary

• Removes line-height: 1 from .callToActionText and .callToActionAnchor in Uses.module.css — the tight value caused cramped spacing when CTA text wrapped on mobile
• Changes .menuList top from 8.5% to 4rem in Hamburger.module.css — the percentage-based value created a gap on large/tall screens where page content (e.g. the resume button on /work) was visible behind the open menu overlay

Test plan

• View the Uses page on mobile and confirm the CTA under "Podcasts" has natural line spacing
• Open the hamburger menu on a large screen and confirm the overlay covers content flush to the navbar (no resume button peeking through at the top on /work)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6283415) to head (7f4c29c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #433   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          110       110           
=========================================
  Hits           110       110           

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[github-actions]

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