feat(tests): dispute resolution UI — manager escalation + red/blue queue selector

frontend/src/components/test-detail/TestDetailHeader.tsx

@@ -79,6 +79,7 @@ interface TestDetailHeaderProps {
   onStartBlueWork: () => void;
   onOpenValidateModal: (side: "red" | "blue") => void;
   onOpenReviewModal: (side: "red" | "blue") => void;
+  onOpenResolveDisputeModal: () => void;
   onReopen: () => void;
   onPauseTimer: () => void;
   onResumeTimer: () => void;
@@ -100,6 +101,7 @@ export default function TestDetailHeader({
   onStartBlueWork,
   onOpenValidateModal,
   onOpenReviewModal,
+  onOpenResolveDisputeModal,
   onReopen,
   onPauseTimer,
   onResumeTimer,
@@ -329,8 +331,6 @@ export default function TestDetailHeader({
         (role === "blue_lead" && test.blue_validation_status === "rejected") ||
         (role === "admin" && test.blue_validation_status === "rejected");
 
-      const approvingSide: "red" | "blue" =
-        test.red_validation_status === "approved" ? "red" : "blue";
       const rejectingSide: "red" | "blue" =
         test.red_validation_status === "rejected" ? "red" : "blue";
 
@@ -353,9 +353,9 @@ export default function TestDetailHeader({
                   Request Discussion
                 </button>
               )}
-              {/* Change approving vote to rejected */}
+              {/* Change approving vote to rejected — routes to the team at fault */}
               <button
-                onClick={() => onOpenValidateModal(approvingSide)}
+                onClick={onOpenResolveDisputeModal}
                 className="flex items-center gap-1.5 rounded-lg bg-red-700/80 px-4 py-2 text-sm font-medium text-white hover:bg-red-600 transition-colors"
               >
                 <XCircle className="h-4 w-4" />