Add animation curves support

[Gavin-Niederman]

A PR adding support for f-curves and a timeline NodeInput variant.

TODO:

• AnimationCurve
• Timeline NodeInput variant.
• Store timeline curves in document

Demo

untitled.mp4

[gemini-code-assist]

Code Review

This pull request introduces an AnimationCurve implementation, featuring keyframe-based interpolation (Linear, Constant, and Bezier) and integration into the node graph system via new nodes and registry updates. Review feedback suggests refining the evaluation logic to clamp out-of-bounds values to the nearest keyframe for better consistency and optimizing keyframe insertion using binary search to improve performance and data validation.

[Keavon]

Note: I rebased your branch.

[Keavon]

Hey, just checking in on the latest with this, thanks!

[Gavin-Niederman]

Hey, just checking in on the latest with this, thanks!

I haven't been able to do any development in a bit but im going to start working on this again now!

[cubic-dev-ai]

3 issues found across 7 files

Confidence score: 3/5

• node-graph/libraries/core-types/src/animation.rs lets AnimationCurve derive Deserialize directly, which can bypass insert_keyframe ordering/finite-value/dedup invariants that evaluate() depends on for binary_search_by; merging as-is risks incorrect curve evaluation on deserialized data — add validated/custom deserialization (or post-deserialize normalization) before merging.
• node-graph/preprocessor/src/lib.rs in replace_animation_curve_inputs does not skip eval_curve proto nodes, making the pass non-idempotent; repeated preprocessing can re-wrap/rewrite nodes and change graph behavior unexpectedly — add the missing guard and an idempotence regression test before merging.
• node-graph/libraries/core-types/src/animation.rs also has a PR-title policy violation noted by automation, which is low product risk but can still block the integration path — rename the PR title to sentence case to clear the gate.

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