ui redesign, markdown fix + metadata and auth header

frontend/Dockerfile

@@ -1,19 +1,21 @@
-FROM node:latest AS builder
+FROM node:22.12-alpine AS builder
 
 WORKDIR /app
-COPY package*.json ./
-RUN npm install
+COPY package.json package-lock.json ./
+RUN npm ci
 
 COPY . .
 RUN npm run build
 
-FROM node:latest
+FROM node:22.12-alpine
 
 WORKDIR /app
 COPY --from=builder /app/dist ./dist
 COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/package.json ./package.json
 
+USER node
+
 ENV HOST=0.0.0.0
 ENV PORT=4321
 EXPOSE 4321