feat: split core views and add Windows portable auto-update

- split the core page into Home and Version Management
- add responsive layouts and navigation
- implement portable update checks, progress, verification, replacement, and rollback
- generate Windows update packages and release manifests
- add updater, navigation, and release workflow tests

src/appUpdateModel.ts

@@ -0,0 +1,9 @@
+export type AppUpdateIndicatorState = 'available' | 'processing' | null;
+
+export function appUpdateIndicatorState(
+  hasUpdate: boolean,
+  processing: boolean,
+): AppUpdateIndicatorState {
+  if (processing) return 'processing';
+  return hasUpdate ? 'available' : null;
+}