[NO MERGE] MouseEvent.dataTransfer null exception - test failure example

[aaronlademann-wf]

This contains the test for a new extension that will be implemented in another PR, showing that the test is valid - causing the exception that the new extension will remedy.

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure

• Verify aviary.yaml coverage of security relevant code

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