fix: unify update-check API flow across runtimes (#672)

* fix: align update flow across web, desktop, and vscode

Unify runtime update handling in shared UI update state
Adjust desktop and VS Code bridge integration for consistent behavior
Improve server package-manager update plumbing for safer checks

* fix: sync update checks between vscode and server

Align VS Code bridge behavior with server package-manager logic
Reduce mismatches in update detection across runtimes

* fix: stabilize update checks across ui and server

packages/ui/src/lib/desktop.ts

@@ -11,6 +11,7 @@ export type UpdateInfo = {
   currentVersion: string;
   body?: string;
   date?: string;
+  nextSuggestedCheckInSec?: number;
   // Web-specific fields
   packageManager?: string;
   updateCommand?: string;