- registry.npmjs.org was intermittently ETIMEDOUT mid-download from this
host; switched to registry.npmmirror.com (also raised npm's own retry
budget as a second line of defense).
- frontend/package-lock.json on disk was actually an empty directory
(untracked, root-owned — a stray artifact, likely from an old bad
bind-mount), which broke `COPY . .` once npm install got past it.
- documents/page.tsx had a real type error (selectedItem.file narrowing
didn't survive into the .map() closure) that `next dev` never
surfaced but `next build`'s stricter check does — fixed by hoisting
the narrowed array into selectedFiles once instead of re-narrowing
selectedItem.file at each use.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gh2UXUQUVBWroWEnn1FLFG
ogrechkoandClaude Sonnet 5