igloo: fix the global time picker E2E tests

The suite has failed since it landed: the panel's window sits in
`.graphing-graph-header__timestamp`, not in the figure's
`.graphing-graph-timestamp`, and `ServicePage.navigate` raises, so
returning to the page walks the host's service list instead.

JIRA-Ref: CMK-37024
Change-Id: I326dd4baa3c5145938bc4fd5d985a137f7406678

Author: smeagol91

tests/system/gui/test_graph_global_time_picker.py

@@ -15,9 +15,9 @@
 import re
 from typing import Final
 
-import pytest
 from playwright.sync_api import expect
 
+from tests.system.gui.testlib.playwright.pom.graphing.fixtures import open_service_graphs
 from tests.system.gui.testlib.playwright.pom.graphing.timeseries_graph import ServiceGraphs
 from tests.system.gui.testlib.playwright.pom.monitor.dashboard import MainDashboard
 
@@ -40,7 +40,6 @@ def _document_survived(graphs: ServiceGraphs) -> bool:
     return bool(graphs.page.evaluate("window.__cmkGlobalTimePickerMarker === true"))
 
 
-@pytest.mark.skip(reason="CMK-37024; the panel's timestamp is addressed by the wrong class.")
 def test_one_preset_selection_moves_every_graph_on_the_page(
     service_graphs: ServiceGraphs, javascript_errors: list[str]
 ) -> None:
@@ -80,7 +79,6 @@ def test_one_preset_selection_moves_every_graph_on_the_page(
     assert not javascript_errors, f"JavaScript errors were raised: {javascript_errors}"
 
 
-@pytest.mark.skip(reason="CMK-37024; `ServicePage.navigate` raises, so the return trip fails.")
 def test_selected_range_is_not_restored_after_navigating_away(
     service_graphs: ServiceGraphs, javascript_errors: list[str]
 ) -> None:
@@ -102,11 +100,10 @@ def test_selected_range_is_not_restored_after_navigating_away(
 
     # Constructing the page object navigates to it.
     MainDashboard(service_page.page)
-    service_page.navigate()
-    service_graphs.wait_until_rendered()
+    reopened = open_service_graphs(service_page.page, service_page.host_name)
 
     expect(
-        service_graphs.time_picker.active_preset_chip,
+        reopened.time_picker.active_preset_chip,
         "Returning to the page restored the previous range instead of the default",
     ).to_have_text(DEFAULT_PRESET)
     assert not javascript_errors, f"JavaScript errors were raised: {javascript_errors}"

tests/system/gui/testlib/playwright/pom/graphing/fixtures.py

@@ -13,6 +13,7 @@
 from collections.abc import Iterator
 
 import pytest
+from playwright.sync_api import Page
 
 from tests.system.gui.testlib.playwright.pom.graphing.timeseries_graph import ServiceGraphs
 from tests.system.gui.testlib.playwright.pom.monitor.dashboard import MainDashboard
@@ -89,6 +90,29 @@ def fixture_javascript_errors(dashboard_page: MainDashboard) -> Iterator[list[st
     yield errors
 
 
+def open_service_graphs(page: Page, host_name: str) -> ServiceGraphs:
+    """Open the service detail page holding the graphs and wait for them to render.
+
+    Public because `ServicePage.navigate` cannot be: a service page is reached through the
+    host's service list rather than by a route of its own, so a test returning to it after
+    navigating away has to walk the same list again.
+    """
+    services_of_host = ServicesOfHostPage(page, host_name=host_name)
+    services_of_host.services_table.host_services_table(host_name).get_by_role(
+        "link", name=SERVICE_WITH_GRAPHS, exact=True
+    ).click()
+    graphs = ServiceGraphs(
+        ServicePage(
+            page,
+            host_name=host_name,
+            service_name=SERVICE_WITH_GRAPHS,
+            navigate_to_page=False,
+        )
+    )
+    graphs.wait_until_rendered()
+    return graphs
+
+
 @pytest.fixture(name="service_graphs")
 def fixture_service_graphs(
     dashboard_page: MainDashboard,
@@ -99,17 +123,4 @@ def fixture_service_graphs(
 
     Depends on `javascript_errors` so the listener is attached before this navigates.
     """
-    host_name = graph_hosts_with_varying_data[0]
-    services_of_host = ServicesOfHostPage(dashboard_page.page, host_name=host_name)
-    services_of_host.services_table.host_services_table(host_name).get_by_role(
-        "link", name=SERVICE_WITH_GRAPHS, exact=True
-    ).click()
-    service_page = ServicePage(
-        dashboard_page.page,
-        host_name=host_name,
-        service_name=SERVICE_WITH_GRAPHS,
-        navigate_to_page=False,
-    )
-    graphs = ServiceGraphs(service_page)
-    graphs.wait_until_rendered()
-    yield graphs
+    yield open_service_graphs(dashboard_page.page, graph_hosts_with_varying_data[0])

tests/system/gui/testlib/playwright/pom/graphing/timeseries_graph.py

@@ -201,8 +201,13 @@ def resolution_note(self) -> Locator:
 
     @property
     def timestamp(self) -> Locator:
-        """The drawn window, e.g. ``2026-08-06 — 2026-08-07 @ 5min``; one date within a day."""
-        return self.root.locator(".graphing-graph-timestamp")
+        """The drawn window, e.g. ``for 2026-08-06 — 2026-08-07, resolution: 5 min``.
+
+        Collapses to a single date whenever the window stays within one day. Not the
+        ``.graphing-graph-timestamp`` of `GraphTimestamp.vue`: that one belongs to the
+        figure the dashboard widgets render, not to the panel's header.
+        """
+        return self.root.locator(".graphing-graph-header__timestamp")
 
     @property
     def peak_zoom_switch(self) -> Locator: