Address PR review feedback

- pages_controller.rb: scope `before_action :set_comments` to actions that
  use @comments (index, no_router) — server_components/simple/rescript no
  longer trigger an unused query.
- server_components.html.erb: drop hardcoded `id:` from stream_react_component
  call. RoR auto-generates stable unique IDs; hardcoding risks DOM-id
  collisions if the helper is ever called twice and diverges from the
  default pattern used by /no_router and /simple.
- CommentsFeed.jsx: flip RSC_SUSPENSE_DEMO_DELAY to opt-in (=== 'true').
  The previous opt-out guard (!== 'false') made the 800ms delay fire by
  default in any deploy without the env var explicitly set.
  app.yml: add RSC_SUSPENSE_DEMO_DELAY=true to the review-app template so
  the demo still shows the streaming fallback visibly.
- ServerInfo.jsx: drop the Hostname row. The K8s pod name (e.g.
  rails-5fc66bddf6-r8b5r) is infrastructure-fingerprinting fodder for
  forks deployed publicly, and ServerInfo's "look, server-side data"
  intent is fully covered by the remaining six fields.
- stores-registration.js: add a one-line comment noting why 'use client'
  sits on a webpack pack entry (excludes the registration code's
  dependency graph from the RSC bundle).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ihabadham

.controlplane/templates/app.yml

@@ -34,6 +34,10 @@ spec:
       value: '2'
     - name: RENDERER_URL
       value: http://localhost:3800
+    # Enable the artificial Suspense demo delay so the streaming fallback is
+    # visible on the review-app. Off by default in production deployments.
+    - name: RSC_SUSPENSE_DEMO_DELAY
+      value: 'true'
     # RENDERER_PASSWORD and REACT_ON_RAILS_PRO_LICENSE must be created in the
     # Control Plane Secret named by {{APP_SECRETS}} before deploy. cpflow
     # resolves {{APP_SECRETS}} to `{APP_PREFIX}-secrets` — which means review

app/controllers/pages_controller.rb

@@ -3,7 +3,7 @@
 class PagesController < ApplicationController
   include ReactOnRails::Controller
   include ReactOnRailsPro::Stream
-  before_action :set_comments
+  before_action :set_comments, only: %i[index no_router]
 
   def index
     # NOTE: The below notes apply if you want to set the value of the props in the controller, as

app/views/pages/server_components.html.erb

@@ -2,5 +2,4 @@
     props: { comments: @server_components_comments },
     prerender: true,
     auto_load_bundle: true,
-    trace: Rails.env.development?,
-    id: "ServerComponentsPage-react-component-0") %>
+    trace: Rails.env.development?) %>

client/app/bundles/server-components/components/CommentsFeed.jsx

@@ -7,10 +7,10 @@ import TogglePanel from './TogglePanel';
 const marked = new Marked();
 marked.use(gfmHeadingId());
 
-// Default-on small delay so the surrounding <Suspense> fallback is visible
-// in the demo. Set RSC_SUSPENSE_DEMO_DELAY=false to disable (CI / tests).
+// Opt-in delay so the surrounding <Suspense> fallback is visible in the demo.
+// Set RSC_SUSPENSE_DEMO_DELAY=true to enable; defaults off in production.
 async function CommentsFeed({ comments = [] }) {
-  if (process.env.RSC_SUSPENSE_DEMO_DELAY !== 'false') {
+  if (process.env.RSC_SUSPENSE_DEMO_DELAY === 'true') {
     await new Promise((resolve) => {
       setTimeout(resolve, 800);
     });

client/app/bundles/server-components/components/ServerInfo.jsx

@@ -14,7 +14,6 @@ function ServerInfo() {
     totalMemory: (os.totalmem() / (1024 * 1024 * 1024)).toFixed(1),
     freeMemory: (os.freemem() / (1024 * 1024 * 1024)).toFixed(1),
     cpus: os.cpus().length,
-    hostname: os.hostname(),
   };
 
   // Using lodash on the server — this 70KB+ library stays server-side
@@ -29,7 +28,6 @@ function ServerInfo() {
     totalMemory: 'Total RAM (GB)',
     freeMemory: 'Free RAM (GB)',
     cpus: 'CPU Cores',
-    hostname: 'Hostname',
   };
 
   return (

client/app/packs/stores-registration.js

@@ -1,3 +1,4 @@
+// 'use client' keeps this pack and its store imports out of the RSC bundle.
 'use client';
 
 import ReactOnRails from 'react-on-rails-pro';