The large FrameCard preview let the <img> drive height (`flex: 0 0
auto`, `width: auto`, `max-*: 100%`). On wide-container layouts and on
the new V2 1200×1600 dimensions the image's intrinsic size leaked
past the card, and the max-width/max-height combo can drop aspect
ratio in some browsers.
Now: the preview container locks its `aspect-ratio` to
`panelDims(model, orientation)` — same source of truth that drives the
empty-placeholder shape — and the <img> fills the container with
`object-fit: contain`. Container shape is stable whether or not the
thumbnail has loaded; image always scales to fit, portrait or
landscape device, narrow or wide phone column.
emptyAspectStyle no longer needs to carry aspect (parent already has
it); empty-preview placeholder fills 100% of the parent now.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
