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.

LanMountainDesktop.Shared.Contracts/Launcher/LauncherIpc.cs

@@ -5,8 +5,10 @@ public enum StartupStage
     Initializing,
     LoadingSettings,
     LoadingPlugins,
+    TrayReady,
     InitializingUI,
     ShellInitialized,
+    BackgroundReady,
     DesktopVisible,
     ActivationRedirected,
     ActivationFailed,
@@ -35,4 +37,10 @@ public static class LauncherIpcConstants
     public const string VersionEnvVar = "LMD_VERSION";
 
     public const string CodenameEnvVar = "LMD_CODENAME";
+
+    public const string LaunchSourceOptionName = "launch-source";
+
+    public const string RestartParentPidOptionName = "restart-parent-pid";
+
+    public const string RestartPresentationOptionName = "restart-presentation";
 }