Stamp release versions and harden launcher

Add automatic release version stamping and multiple launcher reliability improvements. The Release workflow now runs scripts/Set-ReleaseVersion.ps1 in build jobs to inject tag-derived Version/AssemblyVersion into project metadata; several .csproj/Directory.Build.props and app.manifest files were changed to use a dev placeholder. Introduced AppVersionProvider (and related runtime metadata) to centralize version resolution and updated DeploymentLocator to use it and to prefer package-root/version.json. Launcher startup flow was hardened: added startup success tracking, public-activation recovery path, improved success/fallback semantics, and related IPC handling. UI/UX fixes include OOBE entrance/exit animation improvements (scaling-aware, concurrent fade+translate) and minor window lifecycle reorder in DesktopShellHost. CommandContext now recognizes restart and key=value args. New DesktopTrayService and .trae spec files (spec, checklist, tasks) document shell/tray hardening work. Miscellaneous logging, comments and housekeeping edits across launcher and shared contracts to support the above.

scripts/Set-ReleaseVersion.ps1

@@ -0,0 +1,56 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$Version,
+
+    [Parameter(Mandatory = $true)]
+    [string]$AssemblyVersion
+)
+
+$ErrorActionPreference = 'Stop'
+
+function Update-XmlNodeValue {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Path,
+
+        [Parameter(Mandatory = $true)]
+        [string]$XPath,
+
+        [Parameter(Mandatory = $true)]
+        [string]$Value,
+
+        [hashtable]$NamespaceMap = @{}
+    )
+
+    [xml]$document = Get-Content -Path $Path -Raw
+    $navigator = $document.CreateNavigator()
+    $namespaceManager = New-Object System.Xml.XmlNamespaceManager($navigator.NameTable)
+    foreach ($entry in $NamespaceMap.GetEnumerator()) {
+        $namespaceManager.AddNamespace($entry.Key, $entry.Value)
+    }
+
+    $node = $document.SelectSingleNode($XPath, $namespaceManager)
+    if ($null -eq $node) {
+        throw "Node '$XPath' was not found in '$Path'."
+    }
+
+    $node.InnerText = $Value
+    $document.Save($Path)
+}
+
+$projectFiles = @(
+    'Directory.Build.props',
+    'LanMountainDesktop/LanMountainDesktop.csproj',
+    'LanMountainDesktop.Launcher/LanMountainDesktop.Launcher.csproj',
+    'LanMountainDesktop.Shared.Contracts/LanMountainDesktop.Shared.Contracts.csproj'
+)
+
+foreach ($projectFile in $projectFiles) {
+    Update-XmlNodeValue -Path $projectFile -XPath '/Project/PropertyGroup/Version' -Value $Version
+}
+
+$manifestNamespace = @{ asm = 'urn:schemas-microsoft-com:asm.v1' }
+Update-XmlNodeValue -Path 'LanMountainDesktop/app.manifest' -XPath '/asm:assembly/asm:assemblyIdentity/@version' -Value $AssemblyVersion -NamespaceMap $manifestNamespace
+Update-XmlNodeValue -Path 'LanMountainDesktop.Launcher/app.manifest' -XPath '/asm:assembly/asm:assemblyIdentity/@version' -Value $AssemblyVersion -NamespaceMap $manifestNamespace
+
+Write-Host "Stamped release version metadata. Version=$Version AssemblyVersion=$AssemblyVersion"