Rename the nodes 'Length' -> 'Magnitude', 'Flatten Path' -> 'Combine Paths', 'Vec2 Value' -> 'Combine Vec2', and add a new 'Vec2 Value' node

[Keavon]

No description provided.

[gemini-code-assist]

Code Review

This pull request refactors and renames several nodes to improve consistency: it renames 'Flatten Path' to 'Combine Paths', renames 'Length' to 'Magnitude', and refactors 'Vec2 Value' to take a single vector input while introducing a new 'Combine Vec2' node for separate X and Y inputs. It also adds document migrations to ensure backward compatibility. The review feedback points out a critical issue in the migration path where the old active identifier for the 'Length' node (graphene_core::ops::LengthNode) was omitted from the aliases of the renamed 'Magnitude' node, which would break the loading of existing documents.

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[cubic-dev-ai]

All reported issues were addressed across 19 files

Confidence score: 5/5

• Safe to merge after the addressed issues were fixed.

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