feat: update demo app for Angular Material 21 compatibility#289

Cordobo merged 1 commit intomainCordobo/angularx-qrcode:mainfrom

claude/update-material-angular-21-018S3EvhYqgy27j5tV8VfB4FCordobo/angularx-qrcode:claude/update-material-angular-21-018S3EvhYqgy27j5tV8VfB4FCopy head branch name to clipboard