Codex stop-hook on the prior strip-nested-card-decoration commit
caught a regression: cornerRadius on a media-clipping frame
(`clipContent: true` wrapping an image / video, or roles like
`image-placeholder` / `thumbnail` / `cover-image`) is doing the
rounding work for the photo, not stacking card decoration. Blanket
stripping un-rounded the media against the user's clear intent —
typical pattern is
card { cornerRadius: 16, clipContent: true }
└─ image-placeholder { cornerRadius: 12, clipContent: true }
└─ image
where the inner cornerRadius rounds the photo and the outer rounds
the card frame around it. After the prior pass the inner radius got
stripped (ancestor had cornerRadius too) → square corners on the
photo.
New `MEDIA_CLIP_ROLES` set + `isMediaClipper(node)` helper:
- role match: image, image-card, image-placeholder, video,
video-placeholder, media, media-thumbnail, thumbnail, cover,
cover-image, gallery-item
- shape match: clipContent: true AND has a direct image / video /
media-roled child
Either signal preserves cornerRadius. Other decorations (stroke,
shadow) still get stripped — those ARE redundant card decoration
even on a media wrapper, since the photo's own outline + the
ancestor card already provide the visual frame.
Tests: 2 new cases — clipContent + image, and the role-only path
covering image-placeholder / thumbnail / cover-image / gallery-item.
5755c8cd88