feat: Expose scale factor

[marc2332]

Closes #605
Depends on #606

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 12 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (feat/react-to-scale-factor-changes@1c75fd3). Click here to learn what that means.

Files	Patch %	Lines
crates/renderer/src/app.rs	0.00%	4 Missing ⚠️
crates/renderer/src/renderer.rs	0.00%	4 Missing ⚠️
crates/hooks/src/use_platform.rs	71.42%	2 Missing ⚠️
crates/components/src/graph.rs	0.00%	1 Missing ⚠️
crates/renderer/src/elements/rect.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                          @@
##             feat/react-to-scale-factor-changes     #607   +/-   ##
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  Coverage                                      ?   73.11%           
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  Files                                         ?      190           
  Lines                                         ?    19239           
  Branches                                      ?        0           
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  Hits                                          ?    14067           
  Misses                                        ?     5172           
  Partials                                      ?        0           

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