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/Helpers/SecurityModeMapperTests.cs

@@ -55,4 +55,4 @@ public class SecurityModeMapperTests
     {
         SecurityModeMapper.FromString(null!).ShouldBe(SecurityMode.None);
     }
-}
+}