fix(tests): Remove unused fireEvent import in ErrorBoundary.test.tsx (CodeQL #541)

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Summary

fireEvent is imported but never used in ErrorBoundary.test.tsx line 2. This triggers CodeQL alert #541 (Unused variable, import, function or class).

Affected file

src/UILayer/web/src/components/ErrorBoundary/ErrorBoundary.test.tsx — line 2

Required fix

Remove fireEvent from the import statement.

References

• Code scanning alert: https://github.com/phoenixvc/cognitive-mesh/security/code-scanning/541
• PR Phase 16: Remaining widgets, role-based UI, frontend tests #361 review: Phase 16: Remaining widgets, role-based UI, frontend tests #361 (comment)

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