FROM node:24-alpine
WORKDIR /app

# Install dependencies first so this layer caches independently of source changes.
COPY frontend/package.json frontend/package-lock.json ./
RUN npm install

# Copy the rest of the frontend. The dev compose overlays individual paths
# (./frontend/src, ./frontend/public, ./frontend/index.html) with host bind
# mounts for live reload; if those bind mounts are absent (DinD, CI, k8s)
# the image is still self-contained and `npm run dev` will serve from the
# COPY'd files.
COPY frontend/ .

EXPOSE 3000
CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0"]