Fix: Add validation for parsed JSON in ImportFormModal

[prjanitor]

Summary

Fixed a bug in ImportFormModal.tsx where the code parsed JSON from user input without checking if the result is an array. If a user imports a JSON file containing null, a string, or an object (not an array), accessing forms.length would throw a TypeError.

Changes

• Added Array.isArray() check after parsing JSON
• Shows user-friendly error toast if the JSON is not an array
• Prevents runtime errors from invalid JSON formats

Testing

Test with the following JSON inputs:

• Valid: [{}] (array) - should import successfully
• Invalid: null - should show error toast
• Invalid: {} - should show error toast
• Invalid: "string" - should show error toast

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