fix(ci): resolve puppeteer and linter issues

Issues Fixed:
1. Puppeteer command failing with 'puppeteer: not found'
   - Need to install puppeteer package before running browsers install
   - Added 'pnpm add -D puppeteer' before npx command

2. ESLint error: unused variable 'item' in validation.ts
   - Changed 'item' parameter to '_' (unused variable convention)
   - Keeps forEach index parameter without unused variable warning

Changes:
- Update CI workflow to install puppeteer before Chrome
- Fix unused variable in parser/src/utils/validation.ts:18

Testing:
- ESLint passes locally after fix
- Puppeteer installation works with package install first

Refs: CI failures #18589389605

Author: alpha912

.github/workflows/ci.yml

@@ -217,8 +217,10 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
-      - name: Install Chrome for Puppeteer
-        run: npx puppeteer browsers install chrome
+      - name: Install Puppeteer and Chrome
+        run: |
+          pnpm add -D puppeteer
+          npx puppeteer browsers install chrome
         
       - name: Build packages
         run: pnpm run build