feat: init desktop app

apps/desktop/script/setup.ps1

@@ -0,0 +1,27 @@
+# Installs the native build tools GPUI needs to compile on Windows.
+# Run script/setup-rust.ps1 first if you don't have Rust installed yet.
+
+$ErrorActionPreference = "Stop"
+
+function Check-VSBuildTools {
+  $vswhere = "C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe"
+
+  if (-not (Test-Path $vswhere)) {
+    return $false
+  }
+
+  $result = & $vswhere -latest -requires Microsoft.VisualStudio.Workload.NativeDesktop -property installationPath
+  return $result -and $result.Trim().Length -gt 0
+}
+
+if (-not (Check-VSBuildTools)) {
+  Write-Output ""
+  Write-Output "Visual Studio Build Tools with 'Desktop development with C++' not found."
+  Write-Output ""
+  Write-Output "Install it from: https://visualstudio.microsoft.com/visual-cpp-build-tools/"
+  Write-Output "Check the 'Desktop development with C++' workload during setup, then re-run this script."
+  Write-Output ""
+  exit 1
+}
+
+Write-Output "Desktop native dependencies ready."