Add complete test app demonstrating React on Rails v15.0 with Rails 8.0.2.1

- Created test-react-on-rails-v15-hello-world-on-rails-v8 following corrected installation sequence
- Includes Puppeteer test (test_react_app.js) that validates React component rendering
- Screenshot shows successful "Hello World" React component integration
- Test confirms Shakapacker-first installation order is critical for success
- Updated Claude settings to allow node commands for test automation

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

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

Author: justin808

.claude/settings.local.json

@@ -19,7 +19,13 @@
       "Bash(rake lint)",
       "Bash(yarn run:*)",
       "WebFetch(domain:vite-ruby.netlify.app)",
-      "WebSearch"
+      "WebSearch",
+      "Bash(gem install:*)",
+      "Bash(gem search:*)",
+      "Bash(git reset:*)",
+      "Read(//Users/justin/shakacode/react-on-rails/**)",
+      "Bash(./bin/dev)",
+      "Bash(node:*)"
     ],
     "deny": [],
     "ask": []

test-react-on-rails-v15-hello-world-on-rails-v8

@@ -0,0 +1 @@
+Subproject commit 7e2d0ae49391f73c68718c5770e81c2beaec3699