feat: init desktop app

script/setup-rust.ps1

@@ -0,0 +1,23 @@
+# Installs the Rust toolchain via rustup.
+# Run this before any platform-specific setup script.
+
+$ErrorActionPreference = "Stop"
+
+if (Get-Command cargo -ErrorAction SilentlyContinue) {
+    Write-Output "rustup already installed: $(rustup --version)"
+    exit 0
+}
+
+$cargoHome = if ($env:CARGO_HOME) { $env:CARGO_HOME } else { "$env:USERPROFILE\.cargo" }
+$rustupExe = "$cargoHome\bin\rustup.exe"
+
+if (-not (Test-Path $rustupExe)) {
+    Write-Output "Installing rustup..."
+    $installer = "$env:TEMP\rustup-init.exe"
+    Invoke-WebRequest -Uri "https://static.rust-lang.org/rustup/dist/x86_64-pc-windows-msvc/rustup-init.exe" -OutFile $installer
+    & $installer -y --default-toolchain stable
+    Remove-Item -Force $installer
+}
+
+$env:PATH = "$cargoHome\bin;$env:PATH"
+Write-Output "Rust installed: $(& rustc --version)"