Fix: switch npm ci back to npm install --legacy-peer-deps, add diagnostics

Dockerfile

@@ -5,20 +5,27 @@ FROM node:20-alpine AS frontend-build
 
 WORKDIR /build/frontend
 
+# Print versions for diagnostic purposes
+RUN echo "=== Node/npm versions ===" && node --version && npm --version
+
 # Nuke NODE_ENV — CapRover/Docker can inject production
 # which prevents devDependencies (vite, tailwind) from installing
 ENV NODE_ENV=
 
 COPY frontend/package.json frontend/package-lock.json* ./
 
-# Install ALL deps including dev (use ci for reproducible installs)
-RUN npm ci --include=dev && \
-  echo "=== vite check ===" && \
+# npm install (not ci) — more forgiving of lockfile quirks
+# --legacy-peer-deps avoids peer dep conflicts
+# --prefer-offline uses cache when available
+RUN npm install --legacy-peer-deps 2>&1 && \
+  echo "=== install done ===" && \
+  ls node_modules/.bin/vite && \
   ./node_modules/.bin/vite --version
 
 COPY frontend/ ./
 
-RUN NODE_ENV=production ./node_modules/.bin/vite build 2>&1 && \
+RUN echo "=== starting vite build ===" && \
+  NODE_ENV=production ./node_modules/.bin/vite build 2>&1 && \
   echo "=== dist ===" && \
   ls -la dist/