Add RSC support configuration check and clean up comments

- Add configuration check to raise an error if RSC support is not enabled
- Remove TODO comment for uploading RSC assets
- Clean up comments in application layout view
- Remove unnecessary instance variable reset in test helper

Author: AbanoubGhadban

lib/react_on_rails_pro/request.rb

@@ -20,13 +20,19 @@ def render_code(path, js_code, send_bundle)
 
       def render_code_as_stream(path, js_code, is_rsc_payload:)
         Rails.logger.info { "[ReactOnRailsPro] Perform rendering request as a stream #{path}" }
+        if is_rsc_payload && !ReactOnRailsPro.configuration.enable_rsc_support
+          raise ReactOnRailsPro::Error,
+                "RSC support is not enabled. Please set enable_rsc_support to true in your " \
+                "config/initializers/react_on_rails_pro.rb file before " \
+                "rendering any RSC payload."
+        end
+
         ReactOnRailsPro::StreamRequest.create do |send_bundle|
           form = form_with_code(js_code, send_bundle, is_rsc_payload: is_rsc_payload)
           perform_request(path, form: form, stream: true)
         end
       end
 
-      # TODO: add support for uploading rsc assets
       def upload_assets
         Rails.logger.info { "[ReactOnRailsPro] Uploading assets" }
         perform_request("/upload-assets", form: form_with_assets_and_bundle)

spec/dummy/app/views/layouts/application.html.erb

@@ -22,10 +22,8 @@
                           media: 'all',
                           'data-turbolinks-track': true) %>
 
-  <!--  NOTE: Must use defer and not async to keep async scripts loading in correct order  -->
-  <!-- TODO: Investigate and resolve potential issues with async loading when components are split into multiple chunks -->
+  <%# Used for testing purposes to simulate hydration failure %>
   <% unless params[:skip_js_packs] == 'true' %>
-    <%# Used for testing purposes to simulate hydration failure %>
     <%= javascript_pack_tag('client-bundle', 'data-turbolinks-track': true, defer: false) %>
   <% end %>
   <%= csrf_meta_tags %>

spec/dummy/spec/helpers/react_on_rails_pro_helper_spec.rb

@@ -225,7 +225,6 @@ def response; end
     def mock_request_and_response(mock_chunks = chunks)
       # Reset connection instance variables to ensure clean state for tests
       ReactOnRailsPro::Request.instance_variable_set(:@connection, nil)
-      ReactOnRailsPro::Request.instance_variable_set(:@rsc_connection, nil)
       original_httpx_plugin = HTTPX.method(:plugin)
       allow(HTTPX).to receive(:plugin) do |*args|
         original_httpx_plugin.call(:mock_stream).plugin(*args)

spec/dummy/yarn.lock

@@ -5567,7 +5567,7 @@ raw-body@2.5.2:
     iconv-lite "0.4.24"
     unpipe "1.0.0"
 
-react-dom@^19.0.0:
+react-dom@19.0.0:
   version "19.0.0"
   resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-19.0.0.tgz#43446f1f01c65a4cd7f7588083e686a6726cfb57"
   integrity sha512-4GV5sHFG0e/0AD4X+ySy6UJd3jVl1iNsNHdpad0qhABJ11twS3TTBnseqsKurKcsNqCEFeGL3uLpVChpIO3QfQ==
@@ -5661,7 +5661,7 @@ react-side-effect@^2.1.0:
   resolved "https://registry.yarnpkg.com/react-side-effect/-/react-side-effect-2.1.2.tgz#dc6345b9e8f9906dc2eeb68700b615e0b4fe752a"
   integrity sha512-PVjOcvVOyIILrYoyGEpDN3vmYNLdy1CajSFNt4TDsVQC5KpTijDvWVoR+/7Rz2xT978D8/ZtFceXxzsPwZEDvw==
 
-react@^19.0.0:
+react@19.0.0:
   version "19.0.0"
   resolved "https://registry.yarnpkg.com/react/-/react-19.0.0.tgz#6e1969251b9f108870aa4bff37a0ce9ddfaaabdd"
   integrity sha512-V8AVnmPIICiWpGfm6GLzCR/W5FXLchHop40W4nXBmdlEceh16rCN8O8LNWm5bh5XUX91fh7KpA+W0TgMKmgTpQ==