chore: Bump target framework to net10 and update years.

Upgrade project to .NET 10 and refresh copyright years.

- Change TargetFramework in src/Avalonia/Directory.Build.props from net9.0 to net10.0 to target .NET 10.
- Update copyright year range in LICENSE and src/Directory.Build.Props to 2018-2026.
- Add .DS_Store to .gitignore.

.gitignore

@@ -7,3 +7,4 @@
 packages/
 build/outputs
 build/tools
+.DS_Store

LICENSE

@@ -1,6 +1,6 @@
-MIT License
+MIT License
 
-Copyright © HandyOrg 2018-2025
+Copyright © HandyOrg 2018-2026
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

src/Avalonia/Directory.Build.props

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <AvaloniaVersion>11.3.6</AvaloniaVersion>
   </PropertyGroup>
 </Project>

src/Directory.Build.Props

@@ -5,7 +5,7 @@
         <FileVersion>3.6.0.0</FileVersion>
         <AssemblyVersion>3.6.0.0</AssemblyVersion>
         <LangVersion>latest</LangVersion>
-        <Copyright>Copyright © HandyOrg 2018-2025</Copyright>
+        <Copyright>Copyright © HandyOrg 2018-2026</Copyright>
         <Authors>HandyOrg</Authors>
         <RepositoryUrl>https://github.com/HandyOrg/HandyControl</RepositoryUrl>
         <PackageProjectUrl>https://handyorg.github.io/</PackageProjectUrl>