chore(deps): update node docker tag to v26

Author: chrisns

cloudformation/scenarios/minute/docker/frontend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:23-alpine AS base
+FROM node:26-alpine AS base
 
 # Install dependencies only when needed
 FROM base AS deps

cloudformation/scenarios/planx/docker/api/Dockerfile

@@ -1,6 +1,6 @@
 # PlanX API with demo auth overlay
 # Multi-stage build from the PlanX monorepo
-FROM node:24.14-alpine AS build
+FROM node:26.1-alpine AS build
 
 RUN corepack enable && corepack prepare pnpm@latest --activate
 
@@ -22,7 +22,7 @@ RUN cd api.planx.uk && pnpm build
 COPY overlays/demo-auth.js /app/api.planx.uk/dist/demo-auth.js
 
 # Production stage
-FROM node:24.14-alpine AS production
+FROM node:26.1-alpine AS production
 
 RUN corepack enable && corepack prepare pnpm@latest --activate
 

cloudformation/scenarios/planx/docker/editor/Dockerfile

@@ -1,6 +1,6 @@
 # PlanX Editor - pre-built SPA served by nginx
 # Multi-stage build from the PlanX monorepo
-FROM node:24.14-alpine AS build
+FROM node:26.1-alpine AS build
 
 RUN corepack enable && corepack prepare pnpm@latest --activate
 

cloudformation/scenarios/planx/docker/sharedb/Dockerfile

@@ -1,6 +1,6 @@
 # PlanX ShareDB — real-time collaborative editing via WebSocket
 # Multi-stage build from the PlanX monorepo
-FROM node:24.14-alpine AS build
+FROM node:26.1-alpine AS build
 
 RUN corepack enable && corepack prepare pnpm@latest --activate
 
@@ -18,7 +18,7 @@ RUN cd sharedb.planx.uk && (pnpm install --frozen-lockfile || pnpm install)
 # ShareDB has no build step — server.js runs directly from source.
 
 # Production stage
-FROM node:24.14-alpine AS production
+FROM node:26.1-alpine AS production
 
 WORKDIR /app