Check for node/npm before building ribbit

pre_build hook now warns and skips the ribbit build if node or npm
are not installed, instead of failing the entire slam build.

Also, copy all of dist/ instead of individual files

.slam/hooks/pre_build

@@ -4,6 +4,18 @@ set -e
 RIBBIT_DIR="lib/ribbit"
 STATIC_DIR="src/ttfrog/themes/default/static"
 
+missing=""
+command -v node >/dev/null 2>&1 || missing="$missing node"
+command -v npm >/dev/null 2>&1  || missing="$missing npm"
+
+if [ -n "$missing" ]; then
+    echo ""
+    echo "WARNING: ribbit build skipped — missing dependencies:$missing"
+    echo "Install Node.js to enable ribbit builds: https://nodejs.org"
+    echo ""
+    exit 0
+fi
+
 echo "Building ribbit..."
 cd "$RIBBIT_DIR"
 npm install --silent
@@ -11,8 +23,6 @@ npm run build --silent
 cd - > /dev/null
 
 echo "Copying ribbit dist files..."
-cp "$RIBBIT_DIR/dist/ribbit.js" "$STATIC_DIR/"
-cp "$RIBBIT_DIR/dist/ribbit.min.js" "$STATIC_DIR/"
-cp "$RIBBIT_DIR/src/ribbit.css" "$STATIC_DIR/"
+cp -r "$RIBBIT_DIR/dist/." "$STATIC_DIR/"
 
 echo "ribbit build complete."