chore: multi-stage Docker Needle build and trim MenuScene dist assets

Build MenuScene in Docker; ignore dist in context; remove bundled dist chunks;
update MenuScene index and MenuController bob defaults.

Made-with: Cursor

Dockerfile

@@ -1,13 +1,26 @@
-# Serves pre-built Needle/Vite output from the repo (Needle/<app>/dist).
-# Build locally first: cd Needle/MenuScene && npm run build
-# Optional: Needle/SampleScene && npm run build (for compose profile "sample")
+# Multi-stage: Vite production build runs during `docker build` / `docker compose build` —
+# no `npm run build` on the host first. The final image is nginx + freshly built `dist/`.
+#
+# Unity still exports into Needle/<app>/assets/ on your machine; include that folder in the
+# build context when it exists (it is not listed in .dockerignore). Clones without `assets/`
+# need a Unity export (or committed assets) before the image can bundle a valid scene.
 
 ARG NEEDLE_APP=MenuScene
 
+FROM node:22-alpine AS builder
+ARG NEEDLE_APP
+WORKDIR /src
+
+COPY Needle/${NEEDLE_APP}/package.json Needle/${NEEDLE_APP}/package-lock.json ./
+RUN npm ci
+
+COPY Needle/${NEEDLE_APP}/ ./
+RUN npm run build
+
 FROM nginx:1.27-alpine
 
 ARG NEEDLE_APP
-COPY Needle/${NEEDLE_APP}/dist /usr/share/nginx/html
+COPY --from=builder /src/dist /usr/share/nginx/html
 COPY docker/nginx-default.conf /etc/nginx/conf.d/default.conf
 
 EXPOSE 80