feat: Add CalendarSelector component and install new dependencies.

server/Dockerfile

@@ -0,0 +1,18 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Copy root package files
+COPY package.json package-lock.json* ./
+
+# Install production dependencies
+RUN npm ci --omit=dev
+
+# Copy server source code
+COPY server ./server
+
+# Expose port
+EXPOSE 3000
+
+# Start server
+CMD ["node", "server/index.js"]