Fix/playground composition build (#16199)

* Fix playground-composition build failures

- Add missing 'Global' line to playground-composition.sln that caused
  autolink to corrupt the solution file (MSB5010)
- Update SampleCustomComponent path to node_modules and remove
  ProjectSection to prevent autolink from adding duplicate entries (MSB5004)
- Exclude @react-native-picker/picker from autolinking when targeting
  composition, as it is a UWP/Paper component incompatible with
  Win32/WinAppSDK (WindowsAppSDK transitive dependency error)
- Use $(DefaultPlatformToolset) instead of hardcoded v143 in
  Playground-Composition.vcxproj and SampleCustomComponent.vcxproj
  for forward compatibility with newer VS versions

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix playground-composition parallel build and lock file issues

- Align ProjectReference in Playground-Composition.vcxproj to use the same
  node_modules path as the .sln, preventing parallel build collisions when
  MSBuild resolves the same project via two different paths (C1041/FTK1011)
- Add /FS flag to SampleCustomComponent for synchronized PDB writes
- Disable RestoreLockedMode for playground-composition local dev builds
  to prevent NU1004 errors from stale lock files

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Anukrati Agrawal <anuagra@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

packages/playground/react-native.config.js

@@ -3,6 +3,10 @@
 const targetComposition = true;
 
 module.exports = {
+  dependencies: {
+    // Picker is a UWP/Paper component not compatible with the composition playground
+    ...(targetComposition && {'@react-native-picker/picker': {platforms: {windows: null}}}),
+  },
   project: {
     windows: {
       sourceDir: 'windows',

packages/playground/windows/ExperimentalFeatures.props

@@ -11,6 +11,8 @@
   <PropertyGroup Label="WinUI3 for fabric" Condition="'$(SolutionName)'=='playground-composition'">
     <RnwNewArch>true</RnwNewArch>
     <UseExperimentalNuget>false</UseExperimentalNuget>
+    <!-- Disable locked restore for local dev; CI overrides via /p:RestoreLockedMode=true -->
+    <RestoreLockedMode>false</RestoreLockedMode>
   </PropertyGroup>
 
 </Project>

packages/playground/windows/playground-composition.sln

@@ -28,11 +28,9 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Mso", "..\..\..\vnext\Mso\M
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Include", "..\..\..\vnext\include\Include.vcxitems", "{EF074BA1-2D54-4D49-A28E-5E040B47CD2E}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SampleCustomComponent", "..\..\sample-custom-component\windows\SampleCustomComponent\SampleCustomComponent.vcxproj", "{A8DA218C-4CB5-48CB-A9EE-9E6337165D07}"
-	ProjectSection(ProjectDependencies) = postProject
-		{F7D32BD0-2749-483E-9A0D-1635EF7E3136} = {F7D32BD0-2749-483E-9A0D-1635EF7E3136}
-	EndProjectSection
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SampleCustomComponent", "..\..\..\node_modules\@rnw-scripts\sample-custom-component\windows\SampleCustomComponent\SampleCustomComponent.vcxproj", "{A8DA218C-4CB5-48CB-A9EE-9E6337165D07}"
 EndProject
+Global
 	GlobalSection(SharedMSBuildProjectFiles) = preSolution
 		..\..\..\vnext\Shared\Shared.vcxitems*{2049dbe9-8d13-42c9-ae4b-413ae38fffd0}*SharedItemsImports = 9
 		..\..\..\vnext\Mso\Mso.vcxitems*{84e05bfa-cbaf-4f0d-bfb6-4ce85742a57e}*SharedItemsImports = 9

packages/playground/windows/playground-composition/Playground-Composition.vcxproj

@@ -54,7 +54,7 @@
   <PropertyGroup Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>$(DefaultPlatformToolset)</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
     <UseDebugLibraries>true</UseDebugLibraries>
@@ -158,7 +158,7 @@
     <PackageReference Include="$(V8PackageName)" Version="$(V8Version)" Condition="'$(UseV8)' == 'true'" />
   </ItemGroup>
   <ItemGroup>
-    <ProjectReference Include="..\..\..\sample-custom-component\windows\SampleCustomComponent\SampleCustomComponent.vcxproj">
+    <ProjectReference Include="..\..\..\..\node_modules\@rnw-scripts\sample-custom-component\windows\SampleCustomComponent\SampleCustomComponent.vcxproj">
       <Project>{a8da218c-4cb5-48cb-a9ee-9e6337165d07}</Project>
     </ProjectReference>
   </ItemGroup>

packages/sample-custom-component/windows/SampleCustomComponent/SampleCustomComponent.vcxproj

@@ -48,7 +48,7 @@
   <PropertyGroup Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v143</PlatformToolset>
+    <PlatformToolset>$(DefaultPlatformToolset)</PlatformToolset>
     <GenerateManifest>false</GenerateManifest>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
@@ -76,7 +76,7 @@
       <PrecompiledHeaderOutputFile>$(IntDir)pch.pch</PrecompiledHeaderOutputFile>
       <WarningLevel>Level4</WarningLevel>
       <SDLCheck>true</SDLCheck>
-      <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
+      <AdditionalOptions>%(AdditionalOptions) /bigobj /FS</AdditionalOptions>
       <DisableSpecificWarnings>4453;28204</DisableSpecificWarnings>
       <PreprocessorDefinitions>_WINRT_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalUsingDirectories>$(WindowsSDK_WindowsMetadata);$(AdditionalUsingDirectories)</AdditionalUsingDirectories>