(ui) Separate healthy and problematic dashboard runs

Split dashboard host cards into last successful backup and latest warning
or failed run so operators can quickly see whether a host is protected even
when recent activity produced an issue.

Also add queued and warning run counts to the dashboard summary metrics.

src/pobsync_backend/tests/test_views.py

@@ -42,6 +42,19 @@ class ViewTests(TestCase):
             snapshot=snapshot,
             started_at=datetime(2026, 5, 19, 2, 15, tzinfo=timezone.utc),
         )
+        warning_run = BackupRun.objects.create(
+            host=host,
+            run_type=BackupRun.RunType.SCHEDULED,
+            status=BackupRun.Status.WARNING,
+            started_at=datetime(2026, 5, 19, 3, 15, tzinfo=timezone.utc),
+            result={
+                "ok": True,
+                "prune": {
+                    "ok": False,
+                    "error": "Retention warning",
+                },
+            },
+        )
 
         response = self.client.get(reverse("dashboard"))
 
@@ -50,8 +63,13 @@ class ViewTests(TestCase):
         self.assertContains(response, "web-01")
         self.assertContains(response, "20260519-021500Z__ABCDEFGH")
         self.assertContains(response, "success")
+        self.assertContains(response, "Last Good Backup")
+        self.assertContains(response, "Latest Issue")
         self.assertContains(response, f"Run {run.id}")
+        self.assertContains(response, f"Run {warning_run.id}")
+        self.assertContains(response, "warning")
         self.assertContains(response, "manual")
+        self.assertContains(response, "scheduled")
 
     def test_dashboard_renders_backup_trend_summary(self) -> None:
         self.client.force_login(self.staff_user)
@@ -92,6 +110,8 @@ class ViewTests(TestCase):
         self.assertContains(response, "Runs Until Full")
         self.assertContains(response, "Avg Daily New")
         self.assertContains(response, "Days Until Full")
+        self.assertContains(response, "Warnings")
+        self.assertContains(response, "Queued")
         self.assertContains(response, "Next Run")
         self.assertContains(response, "UTC")
         self.assertContains(response, "10")