feat: AI chat claim confirmation, CDT alias learning, and eligibility auto-trigger fixes

- Claim flow: show green confirm card (patient, CDT codes, service date) before Selenium starts
- CDT lookup: add DIRECT_CODE_MAP + ALIAS_MAP with 60+ dental abbreviations from office fee schedule
  (2BW→D0272, 4BW→D0274, PA→D0220, FL→D1208, RCT codes, composite tooth#/surface parser, etc.)
- Composite filling parser: auto-map "#29 OB" → D2392 based on tooth# (front/back) and surface count
- Ask-and-learn: unknown CDT terms block claim and ask user; answer saved to DB alias map for future use
- Cancel on confirm card returns to chat (not full reset) so user can correct and retry
- Eligibility auto-trigger fix: reset autoTriggeredRef when autoTrigger resets to false so second
  chatbot eligibility check on same page visit fires correctly (all 5 provider buttons fixed)
- check_eligibility by name now returns eligibility_id_ready with correct siteKey for non-MH patients
- DDMA/CCA/United/Tufts fee schedules updated with office prices (single Price field, no age split)
- getCodeMap case-insensitive matching fix (ddma/cca/etc. now correctly selected)
- Family plan member disambiguation: insuranceId+DOB composite lookup prevents overwriting siblings
- AI chat date fix: send clientDate from browser to avoid UTC midnight rollover (EST→wrong day)
- AI prompt: appointmentDate extracted for claim_only intent when user says "today" or a date

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

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