chore: add package.json to deploy-pages workflow trigger paths

InfoBox component reads version from parent package.json via Vite config,
so deploy should trigger when version changes.

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

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

Author: sungjun-lee2

.github/workflows/deploy-pages.yml

@@ -5,6 +5,7 @@ on:
     branches: [ main ]
     paths:
       - 'web-preview/**'
+      - 'package.json'
       - '.github/workflows/deploy-pages.yml'
   workflow_dispatch: