Replaced unload with pagehide#85
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This PR implements BFCache (Back/Forward Cache) compatibility for smart payment buttons by replacing blocking beforeunload and unload event listeners with BFCache-compatible pagehide events. This enables instant back/forward navigation for users, improving the browsing experience by allowing browsers to cache entire pages in memory.
https://paypal.atlassian.net/browse/DTPPCPSDK-2854