Make sure we hide the rendering message when completion finishes

[joelhulen]

Make sure we hide the rendering message when completion finishes

The issue or feature being addressed

Ensures the rendering message disappears after the completion ends (fails or completes). The "Rendering" status no longer appears as the message animates, rendering the response when the completed message returns. The "Thinking" status still appears while the completion request is still processing.

Details on the issue fix or feature implementation

N/A

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• I have included unit tests for the issue/feature
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• I have successfully run a local build
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• I have updated relevant docs, where applicable

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