feat(phase-18): add in-app notification system (T-128, T-129)

backend/app/services/test_workflow_service.py

@@ -20,6 +20,7 @@ from app.models.enums import TestState
 from app.models.test import Test
 from app.models.user import User
 from app.services.audit_service import log_action
+from app.services.notification_service import notify_test_state_change
 
 # ---------------------------------------------------------------------------
 # Valid transition map
@@ -91,6 +92,12 @@ def transition_state(
         details=details,
     )
 
+    # Dispatch in-app notifications for the new state
+    try:
+        notify_test_state_change(db, test, target_state.value)
+    except Exception:
+        pass  # Notifications are best-effort — don't block the workflow
+
     return test
 
 
@@ -250,9 +257,17 @@ def check_dual_validation(db: Session, test: Test) -> Test:
     if red_status == "rejected" or blue_status == "rejected":
         test.state = TestState.rejected
         db.commit()
+        try:
+            notify_test_state_change(db, test, "rejected")
+        except Exception:
+            pass
     elif red_status == "approved" and blue_status == "approved":
         test.state = TestState.validated
         db.commit()
+        try:
+            notify_test_state_change(db, test, "validated")
+        except Exception:
+            pass
     else:
         # One side hasn't voted yet — stay in_review, just flush
         db.commit()