feat: United/DentalHub + Tufts SCO pre-auth, cloud storage search & file thumbnails
- Add United/DentalHub pre-authorization Selenium worker, helpers, backend route/processor/client, and frontend OTP modal + wired button
- Add Tufts SCO pre-authorization Selenium worker, helpers, backend route/processor/client, and frontend OTP modal + wired button
- Fix btnSubmitAuthorization selector for UnitedDH preauth step2
- Fix Tufts SCO preauth step3 to target <span>pre-authorization</span> button
- Cloud storage search: default to "both" mode so patient folder names match on first search
- Cloud storage folder panel: auto-scroll to panel when opened from search results
- Cloud storage files: show inline image thumbnails and PDF badge in file grid
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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