test: assert all four Rspack pins in bin/switch-bundler

The bin/switch-bundler version-pin test only spot-checked @rspack/core
and webpack. A drift in @rspack/cli or @rspack/plugin-react-refresh within
the RSPACK_DEPS constant would silently pass the existing assertions.

Add assertions for the remaining two rspack pins so future version
changes to bin/switch-bundler cannot regress without a test failure.

The sibling test "installs rspack dependencies in package.json" already
checks all four rspack packages (for the generated package.json), so this
also brings the switch-bundler test into consistency with the adjacent
pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ihabadham

react_on_rails/spec/react_on_rails/generators/install_generator_spec.rb

@@ -668,6 +668,8 @@ class ActiveSupport::TestCase
       assert_file "bin/switch-bundler" do |content|
         # Version pins are present in the constants
         expect(content).to include("@rspack/core@^2.0.0-0")
+        expect(content).to include("@rspack/cli@^2.0.0-0")
+        expect(content).to include("@rspack/plugin-react-refresh@^2.0.0")
         expect(content).to include("webpack@^5.0.0")
         # Version-stripping regex is used for package.json key deletion
         expect(content).to include('dep[%r{\A(@[^/]+/[^@]+|[^@]+)}]')