chore: replace deep relative imports with alias

[prxt6529]

Summary

• replace deep relative imports with the project alias ("@/") across tests, components, and wave context utilities
• ensure shared wave utilities reference services and helpers through the alias for consistency

Testing

• npm run lint (fails: next not found in environment)

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https://chatgpt.com/codex/tasks/task_e_68de2be7d7d08333bf3f2428bff28b41

[coderabbitai]

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✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/replace-relative-imports-with-path-alias-ux88ag

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[prxt6529]

#1504