[SandObserver]

Summary

• Replace the folder-children row in the troubleshooting "Messages you might see" table with the message Settings now shows.
• Add rows for the duplicate id, disallowed link, not-an-export, import id clash and unreadable YAML import messages.
• Add rows for the unsupported file type, invalid address, socket proxy refused, not a socket proxy and read-only demo messages.

Matches SandObserver/Stackyard#382. Text quoted from ui/i18n/en.json.

Testing
npm run build and npm run check pass. Text-only change to one table.

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:	6b9ec96
Status:	✅  Deploy successful!
Preview URL:	https://8bd6d21c.stackyard-docs.pages.dev
Branch Preview URL:	https://docs-translated-error-messag.stackyard-docs.pages.dev

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