improvement: treatment plan turned into a wizard. shift+click control added to FDI tooth chart for cunnected prosthesises.

backend/prisma/schema.prisma

@@ -176,6 +176,8 @@ model TreatmentDetail {
   sortOrder     Int
   treatmentType String
   teeth         Json
+  /** Selection groups: connected spans + singles. Shape: { groupId, kind, teeth[] }[] */
+  toothSelectionGroups Json?
   comment       String?
 
   treatment   Treatment                   @relation(fields: [treatmentId], references: [id], onDelete: Cascade)
@@ -340,6 +342,8 @@ model LabCaseToothProsthesis {
   treatmentDetailId  String
   tooth              String
   prosthesisTypeCode String
+  /** Links to TreatmentDetail.toothSelectionGroups[].groupId for task grouping. */
+  selectionGroupId   String @default("")
 
   labCase LabCase         @relation(fields: [labCaseId], references: [id], onDelete: Cascade)
   detail  TreatmentDetail @relation(fields: [treatmentDetailId], references: [id], onDelete: Cascade)
@@ -355,6 +359,8 @@ model LabCaseTask {
   teeth              Json
   treatmentType      String
   prosthesisTypeCode String
+  /** Empty string for legacy tasks; otherwise matches selection group id. */
+  selectionGroupId   String        @default("")
   workflowStepCode   String
   stepOrder          Int
   stepLabel          String
@@ -373,7 +379,7 @@ model LabCaseTask {
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
-  @@unique([labCaseId, treatmentDetailId, prosthesisTypeCode, stepOrder])
+  @@unique([labCaseId, treatmentDetailId, selectionGroupId, prosthesisTypeCode, stepOrder])
   @@index([labCaseId, status])
   @@index([assigneeUserId])
   @@map("lab_case_tasks")