feat: report Gitea event stream freshness

tests/test_event_stream.py

@@ -20,6 +20,14 @@ def test_dashboard_has_realtime_gitea_event_stream_widget():
     assert "event.repo?.full_name" in html
 
 
+def test_event_stream_reports_when_activity_was_refreshed():
+    html = DASHBOARD.read_text()
+
+    assert 'id="gitea-events-status"' in html
+    assert "setEventStreamStatus('Updating…')" in html
+    assert "setEventStreamStatus('Updated ' + fmt(new Date()))" in html
+
+
 @pytest.mark.anyio
 async def test_event_stream_returns_recent_authenticated_gitea_activity(monkeypatch):
     expected = [{"type": "create", "actor": {"login": "timmy"}}]