Desktop UI does not build from a clean checkout (npm ci ERESOLVE, react/react-dom major mismatch, missing vite-env.d.ts, broken beforeBuildCommand)

[Justin-vcloud]

Summary

v2/crates/wifi-densepose-desktop/ui cannot be installed or built from a clean checkout. Four independent problems, each blocking the next.

1. npm ci fails — lockfile is unsatisfiable

npm error code ERESOLVE
npm error While resolving: @types/react-dom@19.2.3
npm error Found: @types/react@18.3.28
npm error Could not resolve dependency:
npm error peer @types/react@"^19.2.0" from @types/react-dom@19.2.3

2. react and react-dom are on different majors

ui/package.json declares:

"react": "^18.3.1",
"react-dom": "^19.2.5"

react-dom@19's createRoot requires React 19. Forcing the install through with --legacy-peer-deps converts the install error into a blank white window at runtime — the assets load, then React throws on mount.

3. tsc fails — missing vite-env.d.ts

src/main.tsx(3,8): error TS2882: Cannot find module or type declarations
for side-effect import of './design-system.css'.

src/design-system.css exists; nothing in the project references vite/client, and there is no src/vite-env.d.ts, so TypeScript doesn't know about CSS side-effect imports.

4. beforeBuildCommand points at a directory that does not exist

tauri.conf.json:

"beforeDevCommand": "cd ../ui && npm run dev",
"beforeBuildCommand": "cd ../ui && npm run build"

Relative to tauri.conf.json, ../ui resolves to v2/crates/ui, which doesn't exist — the frontend is at v2/crates/wifi-densepose-desktop/ui. cargo tauri build fails with:

Running beforeBuildCommand `cd ../ui && npm run build`
The system cannot find the path specified.
Error beforeBuildCommand `cd ../ui && npm run build` failed with exit code 1

(Changing it to cd ui && … did not work either in my run, so the hook's working directory may not be the config directory — worth confirming on your side.)

Suggested fixes

• Align React: react and react-dom both ^19.2.8; @types/react ^19.2.18, @types/react-dom ^19.2.4. Regenerate package-lock.json — npm ci then succeeds.
• Add ui/src/vite-env.d.ts containing /// <reference types="vite/client" />.
• Fix the beforeBuildCommand / beforeDevCommand paths.

With all four applied, npm ci → npm run build → cargo tauri build --no-bundle completes and the app renders correctly.

Environment: Windows 11, Node 24.14.1, npm 11.11.0, Rust 1.97.1, 5780c239.