fix: check Node.js version, not just presence, in CI

The Act runner has Node.js v18 pre-installed, so the check
`command -v node` passes and skips installing v22. Node 18 is
too old for dependencies like vitest, jsdom, and tailwindcss/oxide.
Now checks the major version and upgrades if < 22.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build-app.yml

@@ -20,12 +20,21 @@ jobs:
   build-linux:
     runs-on: ubuntu-latest
     steps:
-      - name: Install Node.js
+      - name: Install Node.js 22
         run: |
+          NEED_INSTALL=false
           if command -v node >/dev/null 2>&1; then
-            echo "Node.js already installed: $(node --version)"
+            NODE_MAJOR=$(node --version | sed 's/v\([0-9]*\).*/\1/')
+            echo "Found Node.js $(node --version) (major: ${NODE_MAJOR})"
+            if [ "$NODE_MAJOR" -lt 22 ]; then
+              echo "Node.js ${NODE_MAJOR} is too old, upgrading to 22..."
+              NEED_INSTALL=true
+            fi
           else
-            echo "Installing Node.js 22..."
+            echo "Node.js not found, installing 22..."
+            NEED_INSTALL=true
+          fi
+          if [ "$NEED_INSTALL" = true ]; then
             curl -fsSL https://deb.nodesource.com/setup_22.x | sudo -E bash -
             sudo apt-get install -y nodejs
           fi
@@ -140,12 +149,21 @@ jobs:
   build-macos:
     runs-on: macos-latest
     steps:
-      - name: Install Node.js
+      - name: Install Node.js 22
         run: |
+          NEED_INSTALL=false
           if command -v node >/dev/null 2>&1; then
-            echo "Node.js already installed: $(node --version)"
+            NODE_MAJOR=$(node --version | sed 's/v\([0-9]*\).*/\1/')
+            echo "Found Node.js $(node --version) (major: ${NODE_MAJOR})"
+            if [ "$NODE_MAJOR" -lt 22 ]; then
+              echo "Node.js ${NODE_MAJOR} is too old, upgrading to 22..."
+              NEED_INSTALL=true
+            fi
           else
-            echo "Installing Node.js 22 via Homebrew..."
+            echo "Node.js not found, installing 22..."
+            NEED_INSTALL=true
+          fi
+          if [ "$NEED_INSTALL" = true ]; then
             brew install node@22
             brew link --overwrite node@22
           fi