czlonkowski f6c9548839 fix: add validation for fixedCollection structures to prevent 'propertyValues[itemName] is not iterable' error (issue #90) ...

- Add validateFixedCollectionStructures method to detect invalid nested structures
- Add specific validators for Switch, If, and Filter nodes
- Provide auto-fix suggestions that transform invalid structures to correct ones
- Add comprehensive test coverage with 16 test cases
- Integrate validation into EnhancedConfigValidator and WorkflowValidator

This prevents AI agents from creating workflows that fail to load in n8n UI.

2025-08-02 08:16:58 +02:00

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