fix(tests): surface cross-validation and disputed tests in the review queue

Cross-validation (in_review) tests awaiting a lead's vote were only
reachable via the 'My Tasks' toggle, so the default review queue view
never showed them despite being exactly the kind of work a lead
expects to find there. Added an 'Awaiting My Validation' section to
the review queue, and a standalone 'Disputed' section — always
fetched independently of other filters, shown above everything else,
and only rendered when non-empty — since disputed tests need the
most urgent attention.

frontend/src/pages/TestsPage.tsx

@@ -365,9 +365,18 @@ export default function TestsPage() {
   // The auto load-balancer always assigns a reviewer immediately, so
   // "available" here means "assigned to another lead" — visible so a
   // lead can pick up a peer's review if they can't get to it.
-  const { availableReviews, myAssignedReviews } = useMemo(() => {
+  //
+  // Also includes cross-validation (in_review) tests still awaiting this
+  // lead's vote — previously only surfaced by toggling "My Tasks", which
+  // meant a lead landing on this page by default never saw them here at
+  // all despite this being "the review queue" as far as they're concerned.
+  const { availableReviews, myAssignedReviews, pendingMyValidation } = useMemo(() => {
     if (!isReviewLead || !user || !allTests || showMyTasks) {
-      return { availableReviews: [] as typeof tests, myAssignedReviews: [] as typeof tests };
+      return {
+        availableReviews: [] as typeof tests,
+        myAssignedReviews: [] as typeof tests,
+        pendingMyValidation: [] as typeof tests,
+      };
     }
 
     let searchFiltered = allTests;
@@ -391,9 +400,24 @@ export default function TestsPage() {
     const inState = searchFiltered.filter((t) => t.state === reviewState);
     const available = inState.filter((t) => t[reviewerField] !== user.id);
     const mine = inState.filter((t) => t[reviewerField] === user.id);
-    return { availableReviews: available, myAssignedReviews: mine };
+
+    const validationField = user.role === "red_lead" ? "red_validation_status" : "blue_validation_status";
+    const pendingValidation = searchFiltered.filter(
+      (t) => t.state === "in_review" && !t[validationField]
+    );
+
+    return { availableReviews: available, myAssignedReviews: mine, pendingMyValidation: pendingValidation };
   }, [isReviewLead, user, allTests, searchText, platformFilter, showMyTasks]);
 
+  // ── Disputed tests — always fetched independently of the my-tasks
+  // toggle/state filter so this alert never silently disappears just
+  // because the lead is looking at a different view. ──────────────────
+  const { data: disputedTests = [] } = useQuery({
+    queryKey: ["tests", "disputed-queue"],
+    queryFn: () => getTests({ state: "disputed", limit: 200 }),
+    enabled: isReviewLead,
+  });
+
   // ── Formatting helpers ─────────────────────────────────────────────
   const formatDate = (dateStr: string | null | undefined) => {
     if (!dateStr) return "-";
@@ -637,6 +661,32 @@ export default function TestsPage() {
         )}
       </div>
 
+      {/* ── Disputed tests — most urgent, always on top when present ──── */}
+      {isReviewLead && disputedTests.length > 0 && (
+        <div className="rounded-xl border border-amber-500/40 bg-amber-500/5 p-6">
+          <div className="mb-4 flex items-center justify-between">
+            <div className="flex items-center gap-2">
+              <AlertTriangle className="h-5 w-5 text-amber-400" />
+              <h2 className="text-lg font-semibold text-amber-400">Disputed</h2>
+              <span className="rounded-full border border-amber-500/30 bg-amber-500/10 px-2 py-0.5 text-xs font-medium text-amber-400">
+                {disputedTests.length}
+              </span>
+            </div>
+            <span className="text-xs text-amber-400/70">Leads disagree on the outcome — needs resolution</span>
+          </div>
+          <TestTable
+            tests={disputedTests}
+            columns={mainTableColumns}
+            sortKey={sortKey}
+            sortDir={sortDir}
+            handleSort={handleSort}
+            navigate={navigate}
+            formatDate={formatDate}
+            emptyMessage=""
+          />
+        </div>
+      )}
+
       {/* ── Tests Table / Two-Queue View ─────────────────────────────── */}
       {techRole ? (
         /* Two-section queue for red_tech and blue_tech */
@@ -699,6 +749,23 @@ export default function TestsPage() {
             </div>
             <TestTable tests={myAssignedReviews} columns={mainTableColumns} sortKey={sortKey} sortDir={sortDir} handleSort={handleSort} navigate={navigate} formatDate={formatDate} emptyMessage="No reviews currently assigned to you." />
           </div>
+
+          {/* Awaiting My Validation — cross-validation stage (in_review),
+              distinct from the red_review/blue_review gate above: both
+              leads act independently here, so there's no "assigned to
+              someone else" bucket, just "have I voted yet or not". */}
+          <div className="rounded-xl border border-gray-800 bg-gray-900 p-6">
+            <div className="mb-4 flex items-center justify-between">
+              <div className="flex items-center gap-2">
+                <h2 className="text-lg font-semibold text-white">Awaiting My Validation</h2>
+                <span className="rounded-full border border-blue-500/30 bg-blue-500/10 px-2 py-0.5 text-xs font-medium text-blue-400">
+                  {pendingMyValidation.length}
+                </span>
+              </div>
+              <span className="text-xs text-gray-500">Cross-validation — both leads vote independently</span>
+            </div>
+            <TestTable tests={pendingMyValidation} columns={mainTableColumns} sortKey={sortKey} sortDir={sortDir} handleSort={handleSort} navigate={navigate} formatDate={formatDate} emptyMessage="Nothing awaiting your validation right now." />
+          </div>
         </div>
       ) : (
         /* Normal single-table view for admin, viewer, and leads viewing "My Tasks" */