Quest PDF export

Summary by CodeRabbit

• New Features

  • On-demand image conversion endpoint for optimized delivery.
  • Document generation shows an in-progress notification users can track.

• Updates

  • Notifications API now returns a notification handle when created.
  • Document export default changed to PDF.
  • Navigation label changed from "Questions Sheet" to "Work Sheet"; facilitator and player instructions added.

• Chores

  • Added image-processing dependency and updated CI cache key.

• Config

  • Backend TypeScript config updated to include DOM libs.

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