Apply code style formatting and restore partial modifiers on Avalonia views

Linter/formatter pass across the full codebase. Restores required partial
keyword on AXAML code-behind classes that the formatter incorrectly removed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/ZB.MOM.WW.LmxOpcUa.Client.Shared.Tests/Fakes/FakeEndpointDiscovery.cs

@@ -9,7 +9,8 @@ internal sealed class FakeEndpointDiscovery : IEndpointDiscovery
     public int SelectCallCount { get; private set; }
     public string? LastEndpointUrl { get; private set; }
 
-    public EndpointDescription SelectEndpoint(ApplicationConfiguration config, string endpointUrl, MessageSecurityMode requestedMode)
+    public EndpointDescription SelectEndpoint(ApplicationConfiguration config, string endpointUrl,
+        MessageSecurityMode requestedMode)
     {
         SelectCallCount++;
         LastEndpointUrl = endpointUrl;
@@ -31,4 +32,4 @@ internal sealed class FakeEndpointDiscovery : IEndpointDiscovery
             }
         };
     }
-}
+}