Windows: no console window with the app, and the Start Menu shortcut gets its icon (#57)

- printcraft.exe release builds use the GUI subsystem, so launching it no
  longer opens a console window next to it (debug builds keep the console).
- The MSI's Icon id gains its .ico extension: Windows Installer requires it
  for advertised shortcuts and ARPPRODUCTICON, so the Start Menu shortcut and
  Add/Remove Programs showed a blank icon.
- Guards: package.ps1 checks the PE subsystem of both binaries (app = GUI,
  CLI = console) before packaging; packaging-lint fails on an Icon id without
  .ico/.exe.
- The shortcut's description said "image editor"; it's a PDF workbench.

Reported, with the exact fixes, by @MikailuReeves.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/windows/package.ps1

@@ -65,6 +65,19 @@ if (-not $SkipBuild) {
 }
 
 $Bin = Join-Path $TargetDir "$Target\release"
+
+# The PE optional header's Subsystem field: 2 = Windows GUI, 3 = console. The app must be GUI (no
+# console window opens with it, #57); the CLI must stay console so its output reaches the terminal.
+function Get-PeSubsystem([string] $Path) {
+  $bytes = [System.IO.File]::ReadAllBytes($Path)
+  $pe = [BitConverter]::ToInt32($bytes, 0x3C)
+  return [BitConverter]::ToUInt16($bytes, $pe + 0x5C)
+}
+foreach ($check in @(@('printcraft.exe', 2), @('printcraft-cli.exe', 3))) {
+  $subsystem = Get-PeSubsystem (Join-Path $Bin $check[0])
+  if ($subsystem -ne $check[1]) { throw "$($check[0]) has PE subsystem $subsystem, expected $($check[1])" }
+  Write-Output "ok $($check[0]): PE subsystem $subsystem"
+}
 $Stage = Join-Path $TargetDir "windows-package\$Arch"
 Remove-Item -Recurse -Force $Stage -ErrorAction SilentlyContinue
 New-Item -ItemType Directory -Force -Path $Stage | Out-Null

packaging/windows/printcraft.wxs

@@ -17,15 +17,17 @@
       Scope="perMachine"
       Compressed="yes"
       Language="1033">
-    <SummaryInformation Description="PrintCraft image editor" Manufacturer="Learning Machines LLC" />
+    <SummaryInformation Description="PrintCraft PDF workbench" Manufacturer="Learning Machines LLC" />
     <!-- Same-version upgrades let successive pre-releases of one X.Y.Z replace each other
          (MSI versions are numeric, so 1.2.3-rc.1 and 1.2.3-rc.2 are both 1.2.3). -->
     <MajorUpgrade AllowSameVersionUpgrades="yes"
         DowngradeErrorMessage="A newer version of PrintCraft is already installed." />
     <MediaTemplate EmbedCab="yes" CompressionLevel="high" />
 
-    <Icon Id="PrintcraftIcon" SourceFile="$(var.IconPath)" />
-    <Property Id="ARPPRODUCTICON" Value="PrintcraftIcon" />
+    <!-- Windows Installer requires an Icon id ending in .ico or .exe, or advertised shortcuts and
+         Add/Remove Programs show a blank icon (#57). -->
+    <Icon Id="PrintcraftIcon.ico" SourceFile="$(var.IconPath)" />
+    <Property Id="ARPPRODUCTICON" Value="PrintcraftIcon.ico" />
     <Property Id="ARPURLINFOABOUT" Value="https://getartcraft.com/apps/printcraft" />
     <Property Id="ARPURLUPDATEINFO" Value="https://getartcraft.com/apps/printcraft" />
     <Property Id="ARPHELPLINK" Value="https://discord.gg/artcraft" />
@@ -45,8 +47,8 @@
       <Component Id="PrintcraftApp" Guid="E724C1C6-091F-4E21-A685-80D089FDBE21">
         <File Id="PrintcraftExe" Source="$(var.BinDir)\printcraft.exe" KeyPath="yes">
           <Shortcut Id="StartMenuShortcut" Directory="ProgramMenuFolder" Name="PrintCraft"
-              Description="PrintCraft image editor" WorkingDirectory="INSTALLFOLDER" Advertise="yes"
-              Icon="PrintcraftIcon" IconIndex="0" />
+              Description="PrintCraft PDF workbench" WorkingDirectory="INSTALLFOLDER" Advertise="yes"
+              Icon="PrintcraftIcon.ico" IconIndex="0" />
         </File>
 
         <RegistryValue Root="HKLM" Key="Software\Microsoft\Windows\CurrentVersion\App Paths\printcraft.exe" Value="[#PrintcraftExe]" Type="string" />