Fix PWA manifest access behind authenticated proxies #5820
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In environments where BookStack is served behind an authenticated proxy (such as Cloudflare Zero Trust), the browser fails to fetch
manifest.jsonsince credentials are not sent by default.As a result, PWA installation and functionality do not work.
This PR resolves the issue by adding
crossorigin="use-credentials"to the<link rel="manifest">tag, ensuring credentials are included when the manifest is requested.Reference:
https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Manifest#deploying_a_manifest