`hyperframes snapshot` ignores root `data-width`/`data-height`, defaults to 1920×1080 viewport

[sidorovanthon]

Describe the bug

npx hyperframes snapshot captures at a hardcoded 1920×1080 viewport, regardless of the composition's root data-width / data-height. For portrait compositions (1080×1920), the body renders in the upper-left of the capture area, and the lower 840px (everything below y=1080 in the composition) is clipped.

There is no --width / --height flag to override.

Link to reproduction

https://github.com/sidorovanthon/hyperframes-repro-snapshot-portrait

Steps to reproduce

1. Clone the repo above.
2. npm install
3. npx hyperframes snapshot --at 1
4. Open the resulting PNG.

Expected behavior

Either auto-detect viewport from root data-width / data-height, OR accept --width / --height flags. Currently neither happens.

Actual behavior

PNG is 1920×1080. The composition's full 1080×1920 body is not visible — only the upper 1080px is captured. Anything authored at bottom: <px> is clipped.

Suggested fix

snapshot should honor the same viewport-sizing logic that validate and inspect already do (both correctly use the root composition's declared dimensions). At minimum, expose --width / --height flags as an explicit override.

Environment

• hyperframes 0.4.41
• Windows 11, Node 20.x