fix(docker): enforce Node version alignment across build stages

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 # Pin the runtime to the supported engine; update both stages deliberately.
-FROM node:26.8.1-alpine AS migrations
+FROM node:26.8.2-alpine AS migrations
 WORKDIR /app
 ENV NEXT_TELEMETRY_DISABLED=1
 # Keep the bootstrap aligned with package.json packageManager.
@@ -39,7 +39,7 @@ RUN --mount=type=cache,target=/app/.next/cache \
     AUTH_SECRET="build-fixture-not-for-runtime-use-000000000000" \
     pnpm run build
 
-FROM node:26.8.1-alpine AS runner
+FROM node:26.8.2-alpine AS runner
 ARG NEXT_DEPLOYMENT_ID="unknown"
 LABEL org.opencontainers.image.revision="$NEXT_DEPLOYMENT_ID"
 WORKDIR /app