feat: Expose scale factor

[marc2332]

Closes #605
Depends on #606

[codecov]

Codecov Report

Attention: Patch coverage is 9.64286% with 759 lines in your changes missing coverage. Please review.

Project coverage is 73.11%. Comparing base (4e4d5c3) to head (30a5be1).
Report is 2 commits behind head on main.

❗ Current head 30a5be1 differs from pull request most recent head cde6552

Please upload reports for the commit cde6552 to get more accurate results.

Files	Patch %	Lines
crates/renderer/src/renderer.rs	0.00%	524 Missing ⚠️
crates/renderer/src/render.rs	0.00%	105 Missing ⚠️
crates/renderer/src/app.rs	0.00%	38 Missing ⚠️
crates/renderer/src/config.rs	0.00%	36 Missing ⚠️
crates/renderer/src/elements/rect.rs	0.00%	16 Missing ⚠️
crates/renderer/src/accessibility.rs	0.00%	13 Missing ⚠️
crates/freya/src/launch.rs	0.00%	7 Missing ⚠️
crates/state/src/font_style.rs	40.00%	6 Missing ⚠️
crates/state/src/layout.rs	71.42%	4 Missing ⚠️
crates/common/src/event_messages.rs	0.00%	2 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #607      +/-   ##
==========================================
- Coverage   74.26%   73.11%   -1.15%     
==========================================
  Files         194      190       -4     
  Lines       20267    19239    -1028     
==========================================
- Hits        15051    14067     -984     
+ Misses       5216     5172      -44     

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