feat: United/DentalHub claim submission automation and patient list sync

- Add full Selenium automation for United/DentalHub claim submission
  (steps 1-8: login, OTP, patient search, practitioner page, code entry,
  other coverage No, attachments, submit, Status & History PDF)
- Consolidate UnitedDH siteKey to UNITED_SCO throughout app
- Fix procedure date overwrite with Ctrl+A+Delete before typing service date
- Fix OTP popup reliability: emit every poll (no throttle)
- Fix Chrome session persistence: only clear cookies on startup
- Add touchPatient() to storage: claim submission now pushes patient to
  top of list across eligibility, claims, and documents pages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/components/settings/InsuranceCredForm.tsx

@@ -20,7 +20,7 @@ const SITE_KEY_OPTIONS = [
   { value: "DDMA", label: "Delta Dental MA (DDMA)" },
   { value: "DELTAINS", label: "Delta Dental Ins (DELTAINS)" },
   { value: "TUFTS_SCO", label: "Tufts SCO (TUFTS_SCO)" },
-  { value: "UNITED_SCO", label: "United SCO (UNITED_SCO)" },
+  { value: "UNITED_SCO", label: "United SCO / DentalHub (UNITED_SCO)" },
   { value: "CCA", label: "CCA (CCA)" },
 ];