feat: add toggle for showing draft starters on new sessions

Persists draft starter visibility across desktop and web settings
Adds a new OpenChamber visual setting with localization and search support
Hides the draft starter chips when the setting is off

packages/ui/src/lib/api/types.ts

@@ -676,6 +676,7 @@ export interface SettingsPayload {
   pwaAppName?: string;
   mobileKeyboardMode?: 'native' | 'resize-content';
   draftStarters?: DraftStarterRef[];
+  draftStartersVisible?: boolean;
   draftStartersCraftGoalAdded?: boolean;
 
   [key: string]: unknown;