improvement: tasks and cases feature updated based on the new prosthesis types and their steps. the whole assignment proccess removed from the flow.

backend/src/modules/cases/lab-case-task.util.ts

@@ -0,0 +1,11 @@
+import { Prisma } from '@prisma/client';
+
+/** Normalize the JSON `teeth` column of a lab case task into a clean string[]. */
+export function normalizeTaskTeeth(value: Prisma.JsonValue | null | undefined): string[] {
+  if (!Array.isArray(value)) {
+    return [];
+  }
+  return value
+    .filter((v): v is string | number => typeof v === 'string' || typeof v === 'number')
+    .map((v) => String(v));
+}