Default framework title
The document title is still "Vite App", "Create Next App", "React App", or another framework default.
In plain language
The document title is still a framework default.
The tab, the search result, and the link preview will use that title.
A generic fix prompt
Paste this into your coding agent, or apply it by hand: Replace the default document title with the product name and a short description of what the app does. Set it in index.html or in the Next.js metadata export.