feat(covid): Add refresh button to summary page #54
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This PR introduces a refresh button on the COVID-19 Tracker page, allowing users to fetch the latest summary data on demand without needing to reload the entire page.
This resolves issue #26 .
Changes Made
src/pages/Covid.jsx.fetchSummaryfunction now includes a guard to prevent overlapping requests if the button is clicked multiple times.fetchSummaryinuseCallbackfor performance optimization.