ui(hosts): declutter — per-cluster panels, stacked driver identity, abbreviated Last error, Controls in a dialog

The page ran members, the driver-instances heading, and every cluster group
together inside one panel; driver name and id slammed inline; one long driver
exception blew the table out sideways (Controls scrolled out of reach); and the
inline #546 expander row dumped a full-width panel into the table.

- One panel per cluster group, node chips in the panel head.
- Driver id renders on its own muted mono line under the name.
- Last error abbreviated to 60 chars (DisplayText.Abbreviate — #504 rule),
  full text on the tooltip and in the Controls dialog.
- DriverStatusPanel moved from an inline expander row to a modal (one at a
  time); the dialog re-resolves its row from the current groups each render so
  the 5 s rebuild can't strand it, and the Enabled-in-key recycle discipline
  carries over unchanged. HostsPanelWiringTests re-pinned to the dialog markup.

Live-verified on docker-dev: separated cards, in-viewport table, dialog opens
with live breaker/status data and grouped Reconnect|Restart, closes cleanly.

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/HostsPanelWiringTests.cs

@@ -43,17 +43,20 @@ public sealed class HostsPanelWiringTests
     }
 
     /// <summary>
-    ///     The panel must be fed the row's real identity and enabled-state, not literals. Hard-coding
-    ///     any of the three would make every expanded row drive the same driver, or claim a disabled
-    ///     instance is live — both of which a source scan for the tag alone would pass.
+    ///     The panel must be fed the dialog driver's real identity and enabled-state, not literals.
+    ///     Hard-coding any of the three would make every dialog drive the same driver, or claim a
+    ///     disabled instance is live — both of which a source scan for the tag alone would pass.
+    ///     Since the Controls dialog rework the panel renders once, inside the modal, bound to the
+    ///     row that <c>FindControlsDriver()</c> re-resolves from the current groups (<c>cd</c>/<c>cg</c>)
+    ///     — never to a cached row record, which the 5 s rebuild replaces.
     /// </summary>
     [Fact]
-    public void The_panel_is_bound_to_the_rows_own_driver_cluster_and_enabled_state()
+    public void The_panel_is_bound_to_the_dialogs_own_driver_cluster_and_enabled_state()
     {
         var source = ReadHostsPageSource();
 
-        source.ShouldContain("DriverInstanceId=\"@d.DriverInstanceId\"");
-        source.ShouldContain("ClusterId=\"@g.ClusterId\"");
-        source.ShouldContain("Enabled=\"@d.Enabled\"");
+        source.ShouldContain("DriverInstanceId=\"@cd.DriverInstanceId\"");
+        source.ShouldContain("ClusterId=\"@cg.ClusterId\"");
+        source.ShouldContain("Enabled=\"@cd.Enabled\"");
     }
 }