feat(tests): add team queue overview section for leads

red_lead/blue_lead never saw a plain "All Tests" list — they were always
routed into their own review two-queue view or "My Tasks", with no way to
see every test and who's actually working it. Adds an always-visible
section at the end of the Tests page for leads showing every test with
both Red and Blue assignee columns, so they can monitor the queues and
spot a stuck ticket or an overloaded operator.

The list endpoint (GET /tests) now joinedloads the assignee relationships
and resolves usernames the same way the detail endpoint already does, so
the new section doesn't depend on GET /users/operators (lead/manager-only).

backend/app/services/test_crud_service.py

@@ -70,7 +70,10 @@ def _build_test_query(
     Kept as a single source of truth so the displayed page of results and
     the total count it's paginated against can never drift apart.
     """
-    query = db.query(Test).options(joinedload(Test.technique))
+    query = db.query(Test).options(
+        joinedload(Test.technique),
+        joinedload(Test.red_tech_assigned_user), joinedload(Test.blue_tech_assigned_user),
+    )
 
     # Check: state
     if state:

backend/tests/test_test_assignee_username.py

@@ -61,3 +61,24 @@ def test_assignee_username_is_none_when_unassigned(client, db, red_lead_headers,
     body = resp.json()
     assert body["red_tech_assignee"] is None
     assert body["red_tech_assignee_username"] is None
+
+
+def test_list_endpoint_resolves_assignee_usernames_for_team_queue_overview(
+    client, db, red_lead_headers, red_lead_user, red_tech_user, blue_tech_user,
+):
+    """The leads' 'All Tests — Team Queue Overview' section reads assignee
+    usernames off GET /tests (the list endpoint), not just the detail
+    endpoint — both must resolve them the same way."""
+    technique = _seed_technique(db)
+    _seed_test(
+        db, technique, red_lead_user.id,
+        red_tech_assignee=red_tech_user.id, blue_tech_assignee=blue_tech_user.id,
+    )
+
+    resp = client.get("/api/v1/tests", headers=red_lead_headers)
+
+    assert resp.status_code == 200, resp.text
+    body = resp.json()
+    match = next(t for t in body if t["red_tech_assignee"] == str(red_tech_user.id))
+    assert match["red_tech_assignee_username"] == red_tech_user.username
+    assert match["blue_tech_assignee_username"] == blue_tech_user.username

frontend/src/pages/TestsPage.tsx

@@ -706,6 +706,38 @@ export default function TestsPage() {
           <TestTable tests={tests} columns={mainTableColumns} sortKey={sortKey} sortDir={sortDir} handleSort={handleSort} navigate={navigate} formatDate={formatDate} emptyMessage={showMyTasks ? "No pending tasks for your role." : "No tests found matching your filters."} />
         </div>
       )}
+
+      {/* ── Team queue overview for leads ─────────────────────────────
+          red_lead/blue_lead never hit the plain "All Tests" branch above —
+          they're always routed into the review two-queue view or their
+          own "My Tasks" — so they had no way to see every test and who's
+          working it, which is what they need to spot a stuck ticket or an
+          overloaded operator. Always shown at the end, independent of the
+          my-tasks toggle above, with assignees visible on both sides. */}
+      {isReviewLead && (
+        <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">All Tests — Team Queue Overview</h2>
+              <span className="rounded-full border border-gray-600 bg-gray-800 px-2 py-0.5 text-xs font-medium text-gray-300">
+                {tests.length}
+              </span>
+            </div>
+            <span className="text-xs text-gray-500">Every test, with who's assigned on each side</span>
+          </div>
+          <TestTable
+            tests={tests}
+            columns={mainTableColumns}
+            sortKey={sortKey}
+            sortDir={sortDir}
+            handleSort={handleSort}
+            navigate={navigate}
+            formatDate={formatDate}
+            emptyMessage="No tests found matching your filters."
+            showAssignees
+          />
+        </div>
+      )}
     </div>
   );
 }
@@ -721,6 +753,7 @@ function TestTable({
   navigate,
   formatDate,
   emptyMessage,
+  showAssignees = false,
 }: {
   tests: Test[];
   columns: { key: SortKey; label: string; cls: string }[];
@@ -730,6 +763,9 @@ function TestTable({
   navigate: (path: string) => void;
   formatDate: (d: string | null | undefined) => string;
   emptyMessage: string;
+  /** Adds Red/Blue assignee columns — for the leads' team queue overview,
+   * where seeing who's working each side is the whole point. */
+  showAssignees?: boolean;
 }) {
   return (
     <div className="overflow-x-auto">
@@ -759,6 +795,12 @@ function TestTable({
                 </span>
               </th>
             ))}
+            {showAssignees && (
+              <>
+                <th className="pb-3 px-4 font-medium text-gray-400">Red Assignee</th>
+                <th className="pb-3 px-4 font-medium text-gray-400">Blue Assignee</th>
+              </>
+            )}
             <th className="pb-3 pl-4 font-medium text-gray-400">Action</th>
           </tr>
         </thead>
@@ -819,6 +861,16 @@ function TestTable({
               <td className="py-3 px-4 text-gray-400 text-xs whitespace-nowrap">
                 {formatDate(lastActivityDate(test))}
               </td>
+              {showAssignees && (
+                <>
+                  <td className="py-3 px-4 text-xs text-gray-400 whitespace-nowrap">
+                    {test.red_tech_assignee_username || "-"}
+                  </td>
+                  <td className="py-3 px-4 text-xs text-gray-400 whitespace-nowrap">
+                    {test.blue_tech_assignee_username || "-"}
+                  </td>
+                </>
+              )}
               <td className="py-3 pl-4">
                 <button
                   onClick={(e) => {