Add error scenarios hub and test pages for streaming/RSC error paths

Add a comprehensive error scenarios hub page with:
- Interactive config override controls for raise_on_prerender_error,
  throw_js_errors, and raise_non_shell_server_rendering_errors
- Auto-submit dropdowns with config param forwarding to linked pages
- Detailed documentation of 10 error scenarios (A-I + N) with
  config-aware behavior descriptions
- Summary table showing expected behavior under each config combination

Add test pages for each error scenario:
- SSR shell error, async error, sync error, async prop error
- RSC component error (via server router)
- Stream error demo and stream shell error demo
- Non-existing component pages (non-streaming, streaming, RSC)

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: AbanoubGhadban

react_on_rails_pro/spec/dummy/app/controllers/pages_controller.rb

@@ -19,6 +19,7 @@ class PagesController < ApplicationController # rubocop:disable Metrics/ClassLen
     session[:something_useful] = "REALLY USEFUL"
   end
 
+  before_action :apply_config_overrides
   before_action :data
 
   before_action :initialize_shared_store, only: %i[client_side_hello_world_shared_store_controller
@@ -36,6 +37,57 @@ def cached_react_helmet
     render "/pages/pro/cached_react_helmet"
   end
 
+  def error_scenarios_hub
+    render "/pages/error_scenarios_hub"
+  end
+
+  def reset_error_configs
+    ReactOnRails.configuration.raise_on_prerender_error = Rails.env.development?
+    ReactOnRailsPro.configuration.throw_js_errors = false
+    ReactOnRailsPro.configuration.raise_non_shell_server_rendering_errors = false
+    redirect_to error_scenarios_hub_path
+  end
+
+  def ssr_shell_error
+    stream_view_containing_react_components(template: "/pages/ssr_shell_error")
+  end
+
+  def ssr_async_error
+    stream_view_containing_react_components(template: "/pages/ssr_async_error")
+  end
+
+  def ssr_sync_error
+    stream_view_containing_react_components(template: "/pages/ssr_sync_error")
+  end
+
+  def ssr_async_prop_error
+    stream_view_containing_react_components(template: "/pages/ssr_async_prop_error")
+  end
+
+  def rsc_component_error
+    stream_view_containing_react_components(template: "/pages/rsc_component_error")
+  end
+
+  def non_existing_react_component
+    render "/pages/non_existing_react_component"
+  end
+
+  def non_existing_stream_react_component
+    stream_view_containing_react_components(template: "/pages/non_existing_stream_react_component")
+  end
+
+  def non_existing_rsc_payload
+    stream_view_containing_react_components(template: "/pages/non_existing_rsc_payload")
+  end
+
+  def stream_error_demo
+    stream_view_containing_react_components(template: "/pages/stream_error_demo")
+  end
+
+  def stream_shell_error_demo
+    stream_view_containing_react_components(template: "/pages/stream_shell_error_demo")
+  end
+
   def stream_async_components
     stream_view_containing_react_components(template: "/pages/stream_async_components")
   end
@@ -126,6 +178,10 @@ def server_router
     stream_view_containing_react_components(template: "/pages/server_router")
   end
 
+  def server_side_hello_world_hooks
+    stream_view_containing_react_components(template: "/pages/server_side_hello_world_hooks")
+  end
+
   def posts_page
     posts = fetch_posts.as_json
     posts.each do |post|
@@ -187,6 +243,22 @@ def calc_slow_app_props_server_render
                      locals: { name: PROPS_NAME }, formats: :json)
   end
 
+  def apply_config_overrides
+    bool = ActiveModel::Type::Boolean.new
+
+    if params[:raise_on_prerender_error].present?
+      ReactOnRails.configuration.raise_on_prerender_error =
+        bool.cast(params[:raise_on_prerender_error])
+    end
+    if params[:throw_js_errors].present?
+      ReactOnRailsPro.configuration.throw_js_errors = bool.cast(params[:throw_js_errors])
+    end
+    return unless params[:raise_non_shell_server_rendering_errors].present?
+
+    ReactOnRailsPro.configuration.raise_non_shell_server_rendering_errors =
+      bool.cast(params[:raise_non_shell_server_rendering_errors])
+  end
+
   def initialize_shared_store
     redux_store("SharedReduxStore", props: @app_props_server_render)
   end

react_on_rails_pro/spec/dummy/app/views/pages/error_scenarios_hub.html.erb

@@ -0,0 +1,2 @@
+<%= react_component("NonExistentComponent", props: {}, prerender: true, trace: true,
+    auto_load_bundle: false, id: "non-existent-react-component-0") %>

react_on_rails_pro/spec/dummy/app/views/pages/non_existing_react_component.html.erb

@@ -0,0 +1 @@
+<%= rsc_payload_react_component("NonExistentComponent", props: {}, auto_load_bundle: false) %>

react_on_rails_pro/spec/dummy/app/views/pages/non_existing_rsc_payload.html.erb

@@ -0,0 +1,2 @@
+<%= stream_react_component("NonExistentComponent", props: {}, prerender: true, trace: true,
+    auto_load_bundle: false, id: "non-existent-stream-react-component-0") %>

react_on_rails_pro/spec/dummy/app/views/pages/non_existing_stream_react_component.html.erb

@@ -0,0 +1,7 @@
+<%= stream_react_component(
+  "DeterministicRSCErrorComponent",
+  props: {},
+  prerender: true,
+  trace: true,
+  id: "DeterministicRSCErrorComponent-error-scenario-0",
+) %>

react_on_rails_pro/spec/dummy/app/views/pages/rsc_component_error.html.erb

@@ -0,0 +1,6 @@
+<%= stream_react_component(
+  "StreamErrorDemo",
+  props: {},
+  trace: true,
+  id: "StreamErrorDemo-error-scenario-0",
+) %>

react_on_rails_pro/spec/dummy/app/views/pages/ssr_async_error.html.erb

@@ -0,0 +1,6 @@
+<%= stream_react_component(
+  "AsyncComponentsTreeForTesting",
+  props: @app_props_server_render.merge(throwAsyncError: true),
+  trace: true,
+  id: "AsyncComponentsTreeForTesting-async-prop-error-0",
+) %>

react_on_rails_pro/spec/dummy/app/views/pages/ssr_async_prop_error.html.erb

@@ -0,0 +1,6 @@
+<%= stream_react_component(
+  "StreamShellErrorDemo",
+  props: {},
+  trace: true,
+  id: "StreamShellErrorDemo-error-scenario-0",
+) %>

react_on_rails_pro/spec/dummy/app/views/pages/ssr_shell_error.html.erb

@@ -0,0 +1,6 @@
+<%= stream_react_component(
+  "AsyncComponentsTreeForTesting",
+  props: @app_props_server_render.merge(throwSyncError: true),
+  trace: true,
+  id: "AsyncComponentsTreeForTesting-sync-error-0",
+) %>