Bump Avalonia 11.3.14 -> 11.3.17 (in-line patch)

Patch bump within the 11.3.x line for the core Avalonia packages
(Avalonia, Desktop, Themes.Fluent, Fonts.Inter, Diagnostics). No
breaking changes; ScottPlot.Avalonia 5.1.58 (Avalonia >= 11.3.4)
supports it, so the Query Store charts keep working.

DataGrid (11.3.13) and AvaloniaEdit/TextMate (11.4.1) are already at
their latest 11.x and unchanged. The Avalonia 12 jump remains parked
on branch upgrade/avalonia-12 pending ScottPlot v12 support.

Builds clean (0 errors, no NuGet downgrade/conflict); app launches and
renders on 11.3.17.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: erikdarlingdata

src/PlanViewer.App/PlanViewer.App.csproj

@@ -9,15 +9,15 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.3.14" />
+    <PackageReference Include="Avalonia" Version="11.3.17" />
     <PackageReference Include="Avalonia.AvaloniaEdit" Version="11.4.1" />
     <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.3.13" />
     <PackageReference Include="ScottPlot.Avalonia" Version="5.1.58" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.3.14" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.14" />
-    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.14" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.17" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.17" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.17" />
     <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
-    <PackageReference Include="Avalonia.Diagnostics" Version="11.3.14">
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.3.17">
       <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
       <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
     </PackageReference>