Fix test stubs for node version checking

Add missing stubs for 'node --version 2>/dev/null' command that is called
by check_node_version method. The tests were only stubbing the 'which node'
and 'where node' commands but missing the version check call.

This fixes RSpec test failures where unexpected method calls were being made
during missing_node? checks.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

spec/react_on_rails/generators/install_generator_spec.rb

@@ -73,6 +73,7 @@
     specify "when node is exist" do
       stub_const("RUBY_PLATFORM", "linux")
       allow(install_generator).to receive(:`).with("which node").and_return("/path/to/bin")
+      allow(install_generator).to receive(:`).with("node --version 2>/dev/null").and_return("v20.0.0")
       expect(install_generator.send(:missing_node?)).to be false
     end
   end
@@ -93,6 +94,7 @@
     specify "when node is exist" do
       stub_const("RUBY_PLATFORM", "mswin")
       allow(install_generator).to receive(:`).with("where node").and_return("/path/to/bin")
+      allow(install_generator).to receive(:`).with("node --version 2>/dev/null").and_return("v20.0.0")
       expect(install_generator.send(:missing_node?)).to be false
     end
   end