fix: robust node.js version parsing in installers

Improved Node.js version check logic to handle prefixed version strings and avoid brittle cut commands. Verified with multiple version formats including v24.11.1.

supercharge.sh

@@ -178,7 +178,14 @@ install_dependencies() {
     if ! command -v node &> /dev/null; then
         log_warn "Node.js not found. Some features may not work."
     else
-        log_success "Node.js found: $(node --version)"
+        local node_full_version=$(node -v 2>&1)
+        local node_version=$(echo "$node_full_version" | grep -oE '[0-9]+' | head -n1)
+        
+        if [ ! -z "$node_version" ] && [ "$node_version" -ge 18 ]; then
+            log_success "Node.js found: $node_full_version"
+        else
+            log_warn "Node.js found but too old ($node_full_version). v18+ recommended."
+        fi
     fi
 
     # Check Git