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// One enum drives the whole AI vocabulary — on every component.
_ai = AiState.Thinking;                       // tool call in flight
await foreach (var chunk in chat.GetStreamingResponseAsync(prompt))
{
    _ai = AiState.Streaming;                  // ring + glow speed up
    _text += chunk.Text;
    StateHasChanged();
}
_ai = AiState.Generated;                      // one-shot reveal wash