feat(adminui): ScriptLog live-pill bound to broadcaster health

Subscribe ConnectionStateChanged before reading IsConnected (subscribe-then-read
idiom, matches DriverStatusPanel) so no transition is missed. Add
OnConnectionStateChanged handler that marshals to the circuit sync context via
InvokeAsync. Dispose unsubscribes both events.

Reconnect-overlay: App.razor loads _framework/blazor.web.js and contains no
custom #components-reconnect-modal element; .NET 10 Blazor's default reconnect
overlay is active automatically — no custom markup needed.

No unit tests; live-verify follows.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptLog.razor

@@ -118,10 +118,15 @@ else
         // Live tail straight from the in-process broadcaster (fed by ScriptLogSignalRBridge off the
         // 'script-logs' DPS topic). Blazor Server can't self-connect a SignalR HubConnection behind
         // a reverse proxy — see IInProcessBroadcaster — so we subscribe in-process instead.
+        // Subscribe the state-change event BEFORE reading IsConnected so no transition is missed.
+        ScriptLogs.ConnectionStateChanged += OnConnectionStateChanged;
         ScriptLogs.Received += OnEntry;
-        _connected = true;
+        _connected = ScriptLogs.IsConnected;
     }
 
+    private void OnConnectionStateChanged(bool connected) =>
+        InvokeAsync(() => { _connected = connected; StateHasChanged(); });
+
     private void OnEntry(ScriptLogEntry entry) =>
         // Marshal both the mutation and the re-render onto the circuit sync context so this can't
         // race ClearAsync (which runs there) over the shared _rows list.
@@ -146,5 +151,9 @@ else
         _ => "chip-idle",
     };
 
-    public void Dispose() => ScriptLogs.Received -= OnEntry;
+    public void Dispose()
+    {
+        ScriptLogs.ConnectionStateChanged -= OnConnectionStateChanged;
+        ScriptLogs.Received -= OnEntry;
+    }
 }