feat: sync mobile queue priority across devices (Closes #1464)

tests/e2e/test_adaptive_mobile_queues_release.py

@@ -215,7 +215,7 @@ def test_operator_reorders_routine_queues_without_leaking_priority_between_accou
         assert page.locator("#mobile-queue-active-list [data-mobile-queue]").evaluate_all(
             "rows => rows.map(row => row.dataset.mobileQueue)"
         ) == ["following", "attention", "authored"]
-        expect(page.locator("#mobile-queue-priority-status")).to_have_text("Following moved earlier.")
+        expect(page.locator("#mobile-queue-priority-status")).to_have_text("Sync pending.")
         controls = page.locator(".mobile-queue-priority-controls button")
         assert controls.count() == 18
         assert all((controls.nth(i).bounding_box() or {}).get("height", 0) >= 44 for i in range(controls.count()))