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## Summary by CodeRabbit
* **New Features**
* Native/WASM Mermaid and Typst SVG preview rendering on desktop and
mobile, plus cross-platform Preview plugin integrations.
* **Improvements**
* Centralized, sanitized rendering bridge with automatic Typst
font-directory handling and configurable native renderer selection.
* More consistent and robust error serialization and worker-backed
preview flows for improved stability and performance.
* **Tests**
* Extensive unit and integration tests for preview rendering, font
discovery, sanitization, and error serialization.
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