[SandObserver]

Summary

• Badges: explain the Username and Password rows under Authentication, and that a login in the URL is not sent.
• Security and Troubleshooting: list the sign-in username among the changes that withhold a stored secret.
• Troubleshooting: add the URL login warning to the messages table.

Testing
npm run build and npm run check pass. Text only, no visual change.

Checklist

• npm run build and npm run check both pass.
• Product UI is shown by running or capturing it, never recreated in CSS.
• Any new preview or screenshot carries no private hostnames or real data.
• Visual changes verified in both colour schemes and both docs themes.
• Links to the app repo still resolve.

[cloudflare-workers-and-pages]

Deploying stackyard-docs with    Cloudflare Pages

Latest commit:	a26fde2
Status:	✅  Deploy successful!
Preview URL:	https://8eb7a085.stackyard-docs.pages.dev
Branch Preview URL:	https://docs-badge-sign-in.stackyard-docs.pages.dev

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