fix(campaigns,tests): admin cannot create campaigns, manager can delete unstarted tests, intensify red/blue team colors

- Campaign creation and generate-from-threat-actor now use the strict
  role check — admin no longer gets a free pass into campaign content,
  same principle already applied to test-template creation.
- New manager-only DELETE /tests/{id}: removes a standalone test still
  in draft (not started, not linked to any campaign).
- Replaced the orange/indigo stand-ins used across team badges, tabs,
  action buttons, and timers with true red/blue so Red Team and Blue
  Team read unambiguously at a glance.

backend/app/routers/tests.py

@@ -94,6 +94,11 @@ from app.services.test_crud_service import (
     create_test_from_template as crud_create_from_template,
 )
 
+# Import  from app.services.test_crud_service
+from app.services.test_crud_service import (
+    delete_test as crud_delete_test,
+)
+
 # Import  from app.services.test_crud_service
 from app.services.test_crud_service import (
     get_test_detail as crud_get_test_detail,
@@ -543,6 +548,38 @@ def update_test(
     return test
 
 
+@router.delete("/{test_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_test(
+    test_id: uuid.UUID,
+    db: Session = Depends(get_db),
+    # manager-only, and admin does NOT get a free pass — this is a
+    # queue-cleanup action for the manager role specifically, not a site
+    # administration task.
+    current_user: User = Depends(require_any_role_strict("manager")),
+) -> None:
+    """Delete a standalone test that hasn't started yet.
+
+    Only tests still in ``draft`` state and not linked to any campaign can
+    be deleted this way.
+
+    Args:
+        test_id (uuid.UUID): Primary key of the test to delete.
+        db (Session): SQLAlchemy database session.
+        current_user (User): Authenticated manager performing the deletion.
+    """
+    with UnitOfWork(db) as uow:
+        crud_delete_test(db, test_id)
+        log_action(
+            db,
+            user_id=current_user.id,
+            action="delete_test",
+            entity_type="test",
+            entity_id=test_id,
+            details={},
+        )
+        uow.commit()
+
+
 # ---------------------------------------------------------------------------
 # PATCH /tests/{id}/classification  —  admin data classification
 # ---------------------------------------------------------------------------