Fix Knip dead code detection configuration

- Remove 'nps' from ignoreBinaries (detected by Knip now)
- Add spec/dummy client directories to ignore (dynamically loaded by React on Rails)
- Add runtime dependencies to ignoreDependencies (needed in production mode)

This fixes the failing "Detect dead code" CI check that was also failing on master.

Generated with Claude Code (https://claude.com/claude-code)

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

Author: justin808

knip.ts

@@ -10,8 +10,6 @@ const config: KnipConfig = {
       ignoreBinaries: [
         // Has to be installed globally
         'yalc',
-        // Used in package.json scripts (devDependency, so unlisted in production mode)
-        'nps',
         // Pro package binaries used in Pro workflows
         'playwright',
         'e2e-test',
@@ -112,6 +110,12 @@ const config: KnipConfig = {
         '**/app-react16/**/*',
         // Playwright support files and helpers - generated by cypress-on-rails gem
         'e2e/playwright/support/**',
+        // Components and files used dynamically by React on Rails (registered at runtime)
+        'client/app/actions/**',
+        'client/app/components/**',
+        'client/app/routes/**',
+        'client/app/startup/**',
+        'client/app/store/**',
       ],
       project: ['**/*.{js,cjs,mjs,jsx,ts,cts,mts,tsx}!', 'config/webpack/*.js'],
       paths: {
@@ -124,9 +128,6 @@ const config: KnipConfig = {
         'bin/.*',
       ],
       ignoreDependencies: [
-        // Build-time dependencies not detected by Knip in any mode
-        '@babel/runtime',
-        'mini-css-extract-plugin',
         // There's no ReScript plugin for Knip
         '@rescript/react',
         // The Babel plugin fails to detect it
@@ -136,18 +137,27 @@ const config: KnipConfig = {
         'node-libs-browser',
         // The below dependencies are not detected by the Webpack plugin
         // due to the config issue.
-        'css-loader',
         'expose-loader',
         'file-loader',
         'imports-loader',
         'null-loader',
-        'sass',
-        'sass-loader',
         'sass-resources-loader',
         'style-loader',
         'url-loader',
         // Transitive dependency of shakapacker but listed as direct dependency
         'webpack-merge',
+        // Dependencies not detected in production mode
+        '@babel/runtime',
+        'mini-css-extract-plugin',
+        'css-loader',
+        'sass',
+        'sass-loader',
+        // Dependencies used dynamically by React on Rails
+        'create-react-class',
+        'react-helmet',
+        '@types/react-helmet',
+        'react-redux',
+        'react-router-dom',
       ],
     },
   },