feat: highlight_mode attribute

[marc2332]

Depends on #701

[codecov]

Codecov Report

Attention: Patch coverage is 42.39130% with 53 lines in your changes missing coverage. Please review.

Project coverage is 74.05%. Comparing base (75920c7) to head (1d5e20d).
Report is 2 commits behind head on main.

❗ Current head 1d5e20d differs from pull request most recent head 0a6605e

Please upload reports for the commit 0a6605e to get more accurate results.

Files	Patch %	Lines
crates/core/src/layout/skia_measurer.rs	18.75%	26 Missing ⚠️
crates/renderer/src/elements/paragraph.rs	0.00%	14 Missing ⚠️
crates/renderer/src/elements/label.rs	0.00%	7 Missing ⚠️
crates/state/src/cursor.rs	16.66%	5 Missing ⚠️
crates/renderer/src/render.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #704      +/-   ##
==========================================
- Coverage   74.13%   74.05%   -0.09%     
==========================================
  Files         194      196       +2     
  Lines       20320    20387      +67     
==========================================
+ Hits        15065    15098      +33     
- Misses       5255     5289      +34     

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