New backend, thumbnails, better caching, more repairs

POTENTIAL BREAKING CHANGE

• Move to pymupdf may introduce some characters ("\n" for example) that may break regexes. The integration should automatically create repairs for these.

New features

• Generate thumbnails
• Better caching (only storing scraping/pages we use)
• Improved repairs
• Fixes
  • Config flow reload error (due to hass deprecation)
  • Device_id warning (due to hass deprecation)

Full Changelog: 2026.6.0...2026.9.0