feat: Skip text spans when traversing the DOM

[marc2332]

Closes #402

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2a95293) 53.26% compared to head (1ce59dd) 53.31%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
crates/core/src/layout/layers.rs	97.05%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
+ Coverage   53.26%   53.31%   +0.05%     
==========================================
  Files         143      143              
  Lines       12612    12628      +16     
==========================================
+ Hits         6718     6733      +15     
- Misses       5894     5895       +1     

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