fix(ui): strengthen scrub assertion, cover degraded vdev render path

Addresses code review: differentiate pool_scrub_line/1 FINISHED clause
with the word "finished", test the degraded-vdev callout via a second
DEGRADED pool in the fixture, and replace the generic "scrub" match
with an assertion on the full finished line.

server/lib/server_web/live/host_detail_live.ex

@@ -185,7 +185,7 @@ defmodule ServerWeb.HostDetailLive do
 
   defp pool_scrub_line(%{"scan_state" => "FINISHED", "last_scrub_end" => end_time})
        when is_binary(end_time) and end_time != "",
-       do: "scrub #{end_time}"
+       do: "scrub finished #{end_time}"
 
   defp pool_scrub_line(%{"last_scrub_end" => end_time}) when is_binary(end_time) and end_time != "",
     do: "scrub #{end_time}"

server/test/server_web/live/host_detail_live_test.exs

@@ -33,6 +33,26 @@ defmodule ServerWeb.HostDetailLiveTest do
               %{"name" => "mirror-0", "type" => "mirror", "state" => "ONLINE",
                 "read_errors" => 0, "write_errors" => 0, "checksum_errors" => 0}
             ]
+          },
+          %{
+            "name" => "tank",
+            "health" => "DEGRADED",
+            "pool_type" => "raidz2",
+            "size_bytes" => 8_000_000_000_000,
+            "allocated_bytes" => 6_000_000_000_000,
+            "free_bytes" => 2_000_000_000_000,
+            "capacity_percent" => 75,
+            "fragmentation_percent" => 55,
+            "error_count" => 2,
+            "vdev_count" => 1,
+            "degraded_vdev_count" => 1,
+            "scan_function" => "scrub",
+            "scan_state" => "SCANNING",
+            "last_scrub_end" => nil,
+            "vdevs" => [
+              %{"name" => "raidz2-0", "type" => "raidz2", "state" => "DEGRADED",
+                "read_errors" => 0, "write_errors" => 0, "checksum_errors" => 2}
+            ]
           }
         ]
       },
@@ -93,7 +113,14 @@ defmodule ServerWeb.HostDetailLiveTest do
     assert html =~ "186.3 GB"       # allocated_bytes formatted
     assert html =~ "279.4 GB"       # free_bytes formatted
     assert html =~ "capbar"
-    assert html =~ "scrub"
+    assert html =~ "scrub finished Sat Apr 19 02:00:00 2026"
+    assert html =~ "tank"
+    assert html =~ "DEGRADED"
+    assert html =~ "raidz2"
+    assert html =~ "scrub scanning"
+    assert html =~ "raidz2-0 DEGRADED"
+    assert html =~ "cksum=2"
+    assert html =~ "callout err"
   end
 
   test "404 for unknown host", %{conn: conn} do