[dazzatronus]

The preview drifted from the render on several transitions. Slow slide* and carousel* ran for 2 s where the render takes 1 s. Curves didn't use the render's default handles, cubic-bezier(0.5, 0, 0.5, 1). zoom had no blur. Every vertical slide and carousel played upside down, so slideDown previewed as slideUp. The preview now uses the render's values.

To carry that curve, the builders' keyframe type also accepts smooth.

Verify: npm test (2329, +18). Checked frame by frame against renders of fade, slide, carousel and zoom.

#	PR	Adds	Why separate
1/10	#249	Internal type for the render's default curve	Mechanical, no behaviour change
2/10	#250	Transitions match the render	Transition presets
3/10	#251	shuffle* previews	A missing preset
4/10	#252	Slide effects match the render	Effect presets
5/10	#253	Keyframes hold and ease like the render	Keyframe model
6/10	#254	Presets compose over keyframes	Builds on 2–5
7/10	#255	The toolbar allows presets with keyframes	UI change that needs 6/10
8/10	#256	Default fps matches the render	Output settings
9/10	#257	shotstack-canvas 2.14.1	Dependency bump
10/10	#258	html5 capture sees the page's markup	Uses 9/10's new inputs

Merge bottom-up, retargeting each PR after its predecessor lands. Since #248 the release workflow skips the release when the merged PR's title starts [n/m] with n < m, so 1/10 to 9/10 hold, and 10/10 releases the stack as one version.

Merge subject: [2/10] fix: preview transitions with the render's durations, curves and directions. The repo squashes a single-commit PR under its commit message, so type this in the merge dialog.

[github-actions]

🎉 This PR is included in version 2.29.1 🎉

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• npm package (@latest dist-tag)
• GitHub release

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