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StyleSheet does not properly handle rehydrated style tags

StyleSheet does not properly handle rehydrated style tags: a task in LegoFlow-SWE (Harbor dataset). The StyleSheet class currently has no support for integrating style elements that already exist in the DOM (for example, after server‑side rendering). When such style tags are reused, they bypass…

The task

The `StyleSheet` class currently has no support for integrating style elements that already exist in the DOM (for example, after server‑side rendering). When such style tags are reused, they bypass the sheet’s positioning logic and ownership tracking, leading to two observable problems.

Part of Lego-X/LegoFlow-SWE.