Fix CI failures for Playwright E2E tests

- Update knip.ts to ignore Playwright support files (generated by cypress-on-rails gem)
- Fix GitHub Actions workflow to install root dependencies first
  - This resolves the "tsc not found" error during spec/dummy yarn install
  - The dummy app's preinstall script requires root workspace dependencies to build packages

These fixes address the CI failures from knip unused exports and yarn build errors.

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

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

Author: justin808

.github/workflows/playwright.yml

@@ -8,9 +8,6 @@ on:
 jobs:
   playwright:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: spec/dummy
 
     steps:
       - uses: actions/checkout@v4
@@ -19,23 +16,27 @@ jobs:
         with:
           ruby-version: '3.3'
           bundler-cache: true
-          working-directory: spec/dummy
 
       - uses: actions/setup-node@v4
         with:
           node-version: '20'
           cache: 'yarn'
-          cache-dependency-path: spec/dummy/yarn.lock
 
-      - name: Install dependencies
+      - name: Install root dependencies
+        run: yarn install
+
+      - name: Install dummy app dependencies
+        working-directory: spec/dummy
         run: |
           bundle install
           yarn install
 
       - name: Install Playwright browsers
+        working-directory: spec/dummy
         run: yarn playwright install --with-deps
 
       - name: Run Playwright tests
+        working-directory: spec/dummy
         run: yarn playwright test
 
       - uses: actions/upload-artifact@v4

knip.ts

@@ -102,8 +102,15 @@ const config: KnipConfig = {
         'config/webpack/webpack.config.js',
         // SWC configuration for Shakapacker
         'config/swc.config.js',
+        // Playwright E2E test configuration and tests
+        'e2e/playwright.config.js',
+        'e2e/playwright/e2e/**/*.spec.js',
+      ],
+      ignore: [
+        '**/app-react16/**/*',
+        // Playwright support files and helpers - generated by cypress-on-rails gem
+        'e2e/playwright/support/**',
       ],
-      ignore: ['**/app-react16/**/*'],
       project: ['**/*.{js,cjs,mjs,jsx,ts,cts,mts,tsx}!', 'config/webpack/*.js'],
       paths: {
         'Assets/*': ['client/app/assets/*'],