Built a web frontend for the backlog command using React. Running assist backlog web spins up a local server that serves a single-page app for managing backlog items — viewing, creating, and editing items with descriptions and acceptance criteria. The UI is bundled with tsup and served inline via an HTML template, keeping it self-contained without needing a separate dev server.

Also fixed config saving to preserve unknown keys, so custom or future config values aren’t silently dropped when writing back to assist.yml.