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Miguel Ángel
218eff7d36
* fix(scripts): render template-only blocks in catalog previews The catalog preview renderer treated any file containing `__timelines` as a standalone composition and rendered it as index.html directly. The 12 VS Code snippet blocks register their timeline inside a `<template>`, which stays inert until a host mounts it, so every one of them failed with "Composition has zero duration" and no preview could be produced from the registry at all. Six of the previews on the docs CDN were hand-made from a project still mounting Monokai, so Dark+, High Contrast, High Contrast Light, Solarized Light, Visual Studio Dark and Visual Studio Light all showed Monokai's video. Detect standalone-ness on the document with template content stripped, mount the mirrored install-layout copy so a block's own `../assets/*` references resolve, and capture posters opaque: `format: "png"` is the engine's transparent mode and forces `background-image: none` on every composition root, which erased the desktop backdrop these blocks paint. Publishing gets the missing half too: preview URLs are stable and the objects are uploaded `immutable` with a one-year max-age, so a re-upload alone never reaches a reader. * fix(scripts): install ffmpeg in the preview job and fix the sibling renderer The canary this PR added caught its own regression: the poster transcode shells out to ffmpeg, which ubuntu-latest does not ship and this job never needed, so both canaries failed with `spawnSync ffmpeg ENOENT`. Install it the way every other render job does. `encodeForWeb` has always shelled out to the same binary; the job only got away with it because `--skip-video` skipped that path. generate-template-previews.ts captures posters through the same transparent `format: "png"` mode, so any template painting its own backdrop loses it exactly as the code snippets did. Fixing one renderer and leaving its sibling on the broken call would just move the bug. Also fold the three separate parses of registry-item.json into one read: they had drifted into three different failure behaviours for the same file.