feat(pwa): add install orientation setting (#900)

packages/ui/src/lib/desktop.ts

@@ -119,6 +119,7 @@ export type DesktopSettings = {
   gitProviderId?: string;
   gitModelId?: string;
   pwaAppName?: string;
+  pwaOrientation?: 'system' | 'portrait' | 'landscape';
   inputSpellcheckEnabled?: boolean;
   showToolFileIcons?: boolean;
   showExpandedBashTools?: boolean;