dev: use node:22-slim local

Dockerfile.dev

@@ -1,9 +1,9 @@
-# Dev environment: serves public/ with BrowserSync + content-edits API (port 4175)
-FROM node:20-alpine
-WORKDIR /app
-COPY package*.json ./
-RUN npm install
-COPY . .
-RUN npm run build:pages
-EXPOSE 4175
-CMD ["npm", "run", "serve"]
+# Dev environment: serves public/ with BrowserSync + content-edits API (port 4175)  
+FROM node:22-slim  
+WORKDIR /app  
+COPY package*.json ./  
+RUN npm install  
+COPY . .  
+RUN npm run build:pages  
+EXPOSE 4175  
+CMD ["npm", "run", "serve"]