V4: add WAITING_FOR_FILE_REVIEWER claim status; fix select-outer-parts for split flow

- Add ClaimCaseStatus.WAITING_FOR_FILE_REVIEWER (V4 split flow only)
- Set claim status to WAITING_FOR_FILE_REVIEWER when FileMaker uploads
  the last required document (v3InPersonFlow path), replacing the old
  behaviour that incorrectly auto-advanced to SELECT_OUTER_PARTS
- advanceV3ClaimToOuterPartsIfReady: also allow canAdvance when
  claimCase.status === WAITING_FOR_FILE_REVIEWER so the FileReviewer
  can call select-outer-parts after submitting accident fields
- Add WAITING_FOR_FILE_REVIEWER to CLAIM_USER_PHASE (unified-file-status)
  so the file still resolves to IN_PROGRESS in the unified status report
- Add WAITING_FOR_FILE_REVIEWER to CLAIM_IN_PROGRESS_STATUSES
  (expert-panel-status-report) for the expert report bucket
- Add WAITING_FOR_FILE_REVIEWER to claimInHandling set
  (expert-insurer.service) so insurer stats count these correctly

src/Types&Enums/claim-request-management/claim-case-status.enum.ts

@@ -34,7 +34,15 @@ export enum ClaimCaseStatus {
 
   /** All required factor files are uploaded; damage expert validates factors (`UNDER_REVIEW` @ `EXPERT_COST_EVALUATION`). */
   EXPERT_VALIDATING_REPAIR_FACTORS = "EXPERT_VALIDATING_REPAIR_FACTORS",
-  
+
+  /**
+   * V4 split flow only. FileMaker has uploaded all initial required documents;
+   * the file is sealed and waiting for a FileReviewer to pick it up (accident fields,
+   * capture, and final blame video). Transitions to SELECTING_OUTER_PARTS when the
+   * FileReviewer calls select-outer-parts after submitting accident fields.
+   */
+  WAITING_FOR_FILE_REVIEWER = "WAITING_FOR_FILE_REVIEWER",
+
   // Final states
   COMPLETED = "COMPLETED",
   CANCELLED = "CANCELLED",