fix reloads

frontend/Dockerfile

@@ -1,21 +1,26 @@
+###
+### Frontend development image (hot reload)
+### Runs CRA dev server for fast iteration behind Traefik
+###
+
 FROM node:18-alpine
 
-# Set working directory
 WORKDIR /app
 
-# Copy package files and install dependencies
+# Install dependencies
 COPY package*.json ./
 RUN npm install --silent
 
 # Copy source code
 COPY . .
 
-# Expose port
+# Dev-friendly env for Docker volumes
+ENV CHOKIDAR_USEPOLLING=true \
+    WATCHPACK_POLLING=true \
+    WDS_SOCKET_PORT=0 \
+    DANGEROUSLY_DISABLE_HOST_CHECK=true
+
 EXPOSE 3000
 
-# Health check using Node.js script
-HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
-  CMD node healthcheck.js
-
-# Start the application
+# Start CRA dev server (HMR)
 CMD ["npm", "start"]