fix: respect task page limits and recover stale capacity counts

tests/test_concurrency.py

@@ -290,13 +290,16 @@ class ClientPoolConcurrencyTests(unittest.TestCase):
         client = ModelHubClient(token="test-token")
         calls: list[str] = []
 
-        def page(*, status: str, **_kwargs) -> dict:  # noqa: ANN003
+        def page(*, status: str, current: int = 1, **_kwargs) -> dict:  # noqa: ANN003
             calls.append(status)
-            return {"data": {"total": {"waiting": 175, "running": 25}[status]}}
+            total = {"waiting": 175, "running": 25}[status]
+            return {"data": {"total": total, "records": [
+                {"taskId": f"{status}-{i}", "status": status}
+                for i in range((current - 1) * 100, min(current * 100, total))]}}
 
         client.list_tasks_page = page  # type: ignore[method-assign]
         self.assertEqual(200, client.count_active_tasks_exact())
-        self.assertEqual(["waiting", "running"], calls)
+        self.assertEqual(["waiting", "waiting", "running"], calls)
 
     @staticmethod
     def monday_calibration_time(hour: int = 10) -> datetime: