2026.8.24-canary.916

feat(editor): improve html content color mapping (#15516)

fix #15514

#### PR Dependency Tree


* **PR #15516** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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## Summary by CodeRabbit

* **Bug Fixes**
  * Improved color handling when importing HTML content.
* Added support for hex, RGB/RGBA, percentage, alpha, transparent,
named, and HSL color values.
  * Correctly maps supported colors to the app’s color themes.
* Prevents invalid, translucent, or unsuitable colors from being
applied.
  * Preserves style values containing additional colons during import.
* Improved imported text formatting for supported and unsupported
colors.
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