feat: chat window, preferred language, insurance contact, and AI call eligibility

- Schedule: right-click Chat option opens floating SMS chat window
- Chat window: SMS template selector with appointment date/time pre-filled
- Chat window: office name and phone pulled from Settings > Office Contact
- Chat window: Preferred Language selector (English, Spanish, Portuguese,
  Mandarin, Cantonese, Arabic, Haitian Creole) with fully translated templates
  and locale-aware date/time formatting
- Patient form: Preferred Language field (add/edit), default English
- Settings > Office Contact: added Dental Office Name field
- Settings > Advanced: Insurance Contact page (CRUD — company name + phone)
- Prisma schema: preferredLanguage on Patient, officeName on OfficeContact,
  new InsuranceContact model
- Patient management: Upload Patient Document moved below Patient Records
- Insurance Eligibility: AI Call Insurance collapsible section; insurance
  company and phone auto-populated from saved Insurance Contacts

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

packages/db/prisma/schema.prisma

@@ -42,6 +42,7 @@ model User {
   officeHours          OfficeHours?
   officeContact        OfficeContact?
   procedureTimeslot    ProcedureTimeslot?
+  insuranceContacts    InsuranceContact[]
 }
 
 model Patient {
@@ -59,9 +60,10 @@ model Patient {
   insuranceId       String?
   groupNumber       String?
   policyHolder      String?
-  allergies         String?
-  medicalConditions String?
-  status            PatientStatus          @default(UNKNOWN)
+  allergies          String?
+  medicalConditions  String?
+  preferredLanguage  String?               @default("English")
+  status             PatientStatus         @default(UNKNOWN)
   userId            Int
   createdAt         DateTime               @default(now())
   updatedAt         DateTime               @updatedAt
@@ -593,6 +595,7 @@ model OfficeHours {
 model OfficeContact {
   id               Int     @id @default(autoincrement())
   userId           Int     @unique
+  officeName       String?
   receptionistName String?
   dentistName      String?
   phoneNumber      String?
@@ -604,6 +607,18 @@ model OfficeContact {
   @@map("office_contact")
 }
 
+model InsuranceContact {
+  id          Int      @id @default(autoincrement())
+  userId      Int
+  name        String
+  phoneNumber String?
+  createdAt   DateTime @default(now())
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("insurance_contact")
+}
+
 model ProcedureTimeslot {
   id     Int  @id @default(autoincrement())
   userId Int  @unique