Rename Helm chart from 'tracebloc' to 'client' in Chart.yaml for consistency with new naming convention.

[saadqbal]

Note

Low Risk
Low risk: a metadata-only rename in Chart.yaml with no runtime behavior changes; risk is limited to any external tooling relying on the old chart name.

Overview
Renames the Helm chart in client/Chart.yaml by changing the chart name from tracebloc to client for consistency with the new naming convention.

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