Fix fake change callbacks for collection fields #211
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Problem: The .listen() callback fires for collection fields (ArraySchema/MapSchema) even when other fields change.
Impact: Both cases trigger the field-level change callback with different proxy references (previousValue !== value is always true), causing false positives. Libraries that monitor state changes (like colyseus-events) receive duplicate events or cannot detect actual field replacements.
Solution: Improve change detection to check refIds for collection types before firing field-level callbacks. Only emit when the container instance itself changes