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Miguel Ángel
73dfe35e46
* fix(runtime): show the right scene when the preview DOM comes from another window The Studio preview sometimes builds the composition body in the editor window and adopts it into the preview frame's document. Adopted nodes keep the prototypes of the realm that created them, so `node instanceof HTMLElement` is false for every element in the composition even though the elements are ordinary HTML sitting in that document. Every guard in the runtime written as `if (!(node instanceof HTMLElement))` then skipped the whole document, silently: nothing threw, nothing logged, and readiness still reported success. The timed-element visibility pass wrote no inline visibility at all, so on those loads the preview painted every scene on top of every other and the editor drew off-canvas markers for elements the user could not see. The auto-stamp pass stopped stamping too, which is why the composition came up one timeline clip short. Replace every realm-sensitive element check in the runtime with structural predicates that ask what a node IS (node type, namespace, tag name) rather than which window's constructor made it. Two local `doc.defaultView.HTMLElement` workarounds are deleted with it: they fix only the case where the nodes belong to the document's own realm, and adoption is exactly what breaks that. * fix(studio): scrub the music track the timeline named, not the first audio `resolveScrubAudioEl` tested `byId instanceof HTMLAudioElement` on a node from the preview iframe's document. That node is an instance of the IFRAME's `HTMLAudioElement`, never this module's, so the check was false on every load and the `musicId` hint was dead. Scrub fell through to the first `<audio>` in the document, which the comment right above it warns can be the voiceover, so dragging the playhead could preview the wrong track. Ask what the node is instead. Also close the gaps an independent review found in the runtime fix: - the cross-realm predicate test had no `<audio>` and no `<img>`, so reverting `isAudioElement` or `isImageElement` to `instanceof` left it green. It no longer does, and the audio case also pins `isMediaElement`, which composes from it and gates the media sync path. - nothing stopped the runtime regressing. `lint-runtime-preview-guards.ts` gains a second check kind: patterns that must be ABSENT under a directory, seeded with DOM-typed `instanceof` under `src/runtime`, pointing at domRealm.ts. Comment lines and tests are exempt, both on purpose. - domRealm.ts stated the adoption mechanism as settled fact. The mixed prototypes are measured; how the nodes get into the frame is not identified, and the docstring now says which is which. Its ownership claim is scoped to the runtime, since packages/studio still hand-rolls its own checks.