(ui) Improve dashboard host card scanability

Add per-host status chips for queued, running, warning, and failed runs so
the dashboard shows operational pressure without needing to open each host.

Restructure host cards into clearer backup activity and snapshot health
sections, with less visual clutter and better mobile wrapping.

src/pobsync_backend/tests/test_views.py

@@ -55,6 +55,14 @@ class ViewTests(TestCase):
                 },
             },
         )
+        BackupRun.objects.create(host=host, status=BackupRun.Status.QUEUED)
+        BackupRun.objects.create(host=host, status=BackupRun.Status.RUNNING)
+        BackupRun.objects.create(
+            host=host,
+            run_type=BackupRun.RunType.MANUAL,
+            status=BackupRun.Status.FAILED,
+            started_at=datetime(2026, 5, 19, 1, 15, tzinfo=timezone.utc),
+        )
 
         response = self.client.get(reverse("dashboard"))
 
@@ -70,6 +78,12 @@ class ViewTests(TestCase):
         self.assertContains(response, "warning")
         self.assertContains(response, "manual")
         self.assertContains(response, "scheduled")
+        self.assertContains(response, "Backup activity")
+        self.assertContains(response, "Snapshot health")
+        self.assertContains(response, "queued 1")
+        self.assertContains(response, "running 1")
+        self.assertContains(response, "warning 1")
+        self.assertContains(response, "failed 1")
 
     def test_dashboard_renders_backup_trend_summary(self) -> None:
         self.client.force_login(self.staff_user)