Standardize Node.js version to 24 (#599)

Update Node.js from 20 to 24 across CI workflows, Dockerfiles,
package.json engines field, and add .node-version file for consistent
local development.

.github/workflows/check.yaml

@@ -100,10 +100,10 @@ jobs:
             - name: Install Composer dependencies
               uses: ramsey/composer-install@v2
 
-            - name: Use Node.js 20
+            - name: Use Node.js 24
               uses: actions/setup-node@v4
               with:
-                  node-version: 20
+                  node-version: 24
 
             - name: Install
               run: npm install

.github/workflows/docker.yaml

@@ -61,10 +61,10 @@ jobs:
       - name: Install Composer dependencies
         uses: ramsey/composer-install@v2
 
-      - name: Use Node.js 20
+      - name: Use Node.js 24
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
 
       - name: Install
         run: npm install
@@ -100,10 +100,10 @@ jobs:
         with:
           composer-options: --no-dev
 
-      - name: Use Node.js 20
+      - name: Use Node.js 24
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 24
 
       - name: Install
         run: npm install

.node-version

@@ -0,0 +1 @@
+24

docker/development/Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM node AS static_builder
+FROM --platform=$BUILDPLATFORM node:24 AS static_builder
     WORKDIR /var/www/html
     COPY . /var/www/html
     RUN yarn && yarn build

docker/production/Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM node:20 AS static_builder
+FROM --platform=$BUILDPLATFORM node:24 AS static_builder
     WORKDIR /var/www/html
     COPY . /var/www/html
     RUN yarn && yarn build

package.json

@@ -1,5 +1,8 @@
 {
   "private": true,
+  "engines": {
+    "node": ">=24"
+  },
   "type": "module",
   "scripts": {
     "dev": "vite",