Keep desktop skills up to date automatically (#1309)

* Keep installed desktop skills up to date

* Preserve user files during skill sync

packages/desktop/src/desktop-startup.ts

@@ -3,6 +3,7 @@ export interface DesktopStartupDependencies {
   runCliPassthroughIfRequested: () => Promise<boolean>;
   inheritLoginShellEnv: () => void;
   bootstrapGui: () => Promise<void>;
+  autoUpdateInstalledSkills?: () => void;
 }
 
 export async function runDesktopStartup(deps: DesktopStartupDependencies): Promise<void> {
@@ -12,4 +13,5 @@ export async function runDesktopStartup(deps: DesktopStartupDependencies): Promi
 
   deps.inheritLoginShellEnv();
   await deps.bootstrapGui();
+  deps.autoUpdateInstalledSkills?.();
 }