feat: add Sheet component for bottom sheet UI with drag-to-dismiss and snap points

test: implement DialogStyleContext tests for preference management and style recommendations

test: create tests for useAutoSelection hook, including countdown and pause functionality

feat: implement useAutoSelection hook for enhanced auto-selection with sound notifications

feat: create Zustand store for managing issue submission wizard state

feat: add Zod validation schemas for issue-related API requests

feat: implement issue service for CRUD operations and validation handling

feat: define TypeScript types for issue submission and management

ccw/frontend/src/components/layout/index.ts

@@ -9,6 +9,8 @@ export type { AppShellProps } from './AppShell';
 export { Header } from './Header';
 export type { HeaderProps } from './Header';
 
+export { A2UIButton } from './A2UIButton';
+
 export { Sidebar } from './Sidebar';
 export type { SidebarProps } from './Sidebar';