fix: removed stroke artefacts inside letters

[rastuhacode]

Closes #126

When stroke is added and its color differs from text color the visual artifacts appear inside letters.

The fix is as follows:

1. If stroke being set and it's positive - apply the paint-order rule so fill would cover the stroke and hide inner artifacts if they exist
2. extract this logic to function

Here's the result with the fix with the same config as in the Venom example:

Artifacts outside the letter are still visible, but fixing it is impossible with native svg strokes😞

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Project	Deployment	Actions	Updated (UTC)
capsule-render	Ready	Preview, Comment	Jun 8, 2026 11:31am

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.87%. Comparing base (88a5c79) to head (07b4b05).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   92.77%   92.87%   +0.09%     
==========================================
  Files          28       28              
  Lines         443      449       +6     
  Branches      103      110       +7     
==========================================
+ Hits          411      417       +6     
  Misses         32       32              

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[kyechan99]

lgtm 👍