fix: Parse axis name to match our internal casing [134]

[lanesawyer]

What

Fixes #134.

• Fixes parse logic for axis name so it will always match the casing we use internally for planes
• Added a test to ensure we don't break this in the future

How

-toLowerCase() function on zod parsing

• Wrote a test to make sure the casing matches our CartesianPlane implementation

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[Jarbuckle]

Makes sense! Approved!