Fix Figure rendering to add newline after image

[dereuromark]

Summary

• Fixes Figure node rendering in AnsiRenderer to add newline after non-caption children
• Ensures proper spacing when rendering figures with images

Full Changelog: master...feature/ansi-renderer

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.55%. Comparing base (2e1f9f1) to head (bb70e64).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #101   +/-   ##
=========================================
  Coverage     93.55%   93.55%           
  Complexity     2315     2315           
=========================================
  Files            79       79           
  Lines          6113     6113           
=========================================
  Hits           5719     5719           
  Misses          394      394           

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