Vellium v1.0.0 released: security hardening, wallpaper-based themes, JSON chat export and a major desktop stability pass

Vellium has reached v1.0.0.

It is a local-first desktop workspace for writing, roleplay, character creation, lorebooks and knowledge management with local LLMs. This release promotes the previous v1.0.0-beta build to the first stable version.

The main focus was security and desktop stability. I added stricter Electron security policies, validation for request origins, tighter plugin manifest checks and a global React error boundary. I also reworked parts of the Electron startup and preload flow to fix issues that only appeared after packaging the app.

Chat export has been rebuilt as a proper typed JSON export pipeline, with the server-side logic separated from the route layer and covered by additional tests. The roleplay prompt engine also received a fairly large hardening pass to make prompt construction and tool handling more predictable.

Vellium can now generate a complete UI color theme from a selected wallpaper. The generated theme is applied across the workspace, chat and settings instead of only changing a few accent colors.

I also unified the styling of the Characters, Knowledge, Lorebooks, Pets and Settings screens, fixed the model picker appearing behind the home hero section, added a JSON export button to the chat toolbar and fixed messages scrolling underneath the composer.

This release touched a large part of the desktop stack, so feedback about packaged builds, local model compatibility and UI issues would be especially useful.

GitHub: https://github.com/tg-prplx/vellium