Fix extracted text flashing on SSE stream updates

apps/yaak-client/components/responseViewers/EventStreamViewer.tsx

@@ -219,7 +219,7 @@ function ActualEventStreamViewer({ response }: Props) {
                 <SseSummaryFooter
                   style={style}
                   error={summary.error ? String(summary.error) : null}
-                  isLoading={summary.isLoading}
+                  isLoading={summary.isLoading && summary.data == null}
                   onRenderMarkdownChange={renderMarkdownSetting.set}
                   renderMarkdown={renderMarkdown}
                   resultKeyPath={summarySettings.resultKeyPath ?? ""}

apps/yaak-client/hooks/useResponseBodySseSummary.ts

@@ -6,6 +6,7 @@ import { getResponseBodySseSummary } from "../lib/responseBody";
 export function useResponseBodySseSummary(response: HttpResponse, resultKeyPath: string | null) {
   return useQuery<SseSummary>({
     enabled: resultKeyPath != null,
+    placeholderData: (prev) => prev, // Keep previous data on refetch
     queryKey: [
       "response-body-sse-summary",
       response.id,