feat: add Remaining/Third Party columns, toggle PDF viewer, retire CMSP as separate insurance type

- Add remainingBenefit and thirdPartyInsurance columns to Patient; extract both
  from the MassHealth accumulator/member-detail pages during the eligibility
  check and surface them in the eligibility table
- Add an updated-date display and a toggle to suppress the post-check PDF
  viewer popup (default off) on the insurance eligibility page
- Rename CMSP-prefixed PDF filenames and UI copy to MH, since CMSP and MH now
  share the same worker
- Fold CMSP into MassHealth/MH across patient/claim insurance-type dropdowns
  and the chatbot's eligibility routing, since they're the same insurance
- Remove auto-download of saved eligibility PDFs; downloading is now manual

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/db/shared/schemas/variants/pure/Patient.pure.ts

@@ -20,6 +20,8 @@ export const PatientModelSchema = z.object({
     medicalConditions: z.string().nullable(),
     preferredLanguage: z.string().nullable(),
     status: PatientStatusSchema,
+    remainingBenefit: z.string().nullable(),
+    thirdPartyInsurance: z.string().nullable(),
     userId: z.number().int(),
     createdAt: z.date(),
     updatedAt: z.date(),