fix(api): Add human friendly error messages for control and payload issues.

[rifont]

What changed? Why was the change needed?

• Add human friendly error messages for control and payload issues.

Screenshots

Editor canvas - better error message

Editor side panel - better error message

Expand for optional sections

### Related enterprise PR ### Special notes for your reviewer

[linear[bot]]

NV-4768 🐛 [UX] - New step error hover message is confusing and badly formatted with `[]` wrapper

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commit: 2920b40

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