fix: include options page files in GitHub Actions build workflow

Add missing files for v1.1.0 extension package:
- options.html (options page UI)
- options.js (import/export logic)
- options.css (options page styles)
- shared.js (common utilities)

Ensures complete extension build for Chrome Web Store submission.

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: maepon

.github/workflows/build.yml

@@ -26,6 +26,10 @@ jobs:
         cp popup.html dist/
         cp popup.js dist/
         cp popup.css dist/
+        cp options.html dist/
+        cp options.js dist/
+        cp options.css dist/
+        cp shared.js dist/
         cp -r icons dist/
         
         # zipファイルを作成