Improved JSON Import Error Handling + Validation

When importing JSON for forms or documents, error messages should be more verbose and specific. Instead of generic “invalid format” messages, validation should highlight: • the exact line or section that failed • the field that is missing, duplicated, or incorrectly typed • whether the structure violates required schema • whether blocks must be placed in a specific order (e.g., email block first) Enhancing the importer will: • decrease support requests • improve development speed • help AI-powered tools (like ChatGPT) fix issues efficiently • reduce user frustration • create a smoother, more predictable JSON workflow High-level request: JSON import system should be more forgiving, transparent, and developer-friendly.