Internal: Rethink mutations writer

[marc2332]

Depends on https://github.com/marc2332/freya/pull/729

• remove unnecessary scale factor casts
• Use of proper RealDOMAdapter cache between removals

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.53521% with 39 lines in your changes missing coverage. Please review.

Project coverage is 73.94%. Comparing base (5d99dbe) to head (65f8d11). Report is 1 commits behind head on main.

:exclamation: Current head 65f8d11 differs from pull request most recent head d4dd542

Please upload reports for the commit d4dd542 to get more accurate results.

Files	Patch %	Lines
crates/renderer/src/app.rs	0.00%	25 Missing :warning:
crates/core/src/dom/mutations_writer.rs	86.36%	6 Missing :warning:
crates/renderer/src/window_state.rs	0.00%	5 Missing :warning:
crates/renderer/src/renderer.rs	0.00%	2 Missing :warning:
crates/core/src/dom/dom_adapter.rs	96.77%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #731 +/- ## ========================================== + Coverage 73.91% 73.94% +0.02% ========================================== Files 198 198 Lines 20321 20357 +36 ========================================== + Hits 15020 15052 +32 - Misses 5301 5305 +4 ```

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