feat: add AskUserQuestion functionality with dialog component

- Introduced AskUserQuestionDialog component for displaying questions and collecting user responses in the WebView.
- Updated ACP integration to handle ask user question requests and responses.
- Enhanced session management to include raw input and answers for user questions.
- Modified existing tools and services to support new ask user question feature.
- Updated types and message handling to accommodate new question structure and responses.

packages/webui/src/index.ts

@@ -86,6 +86,12 @@ export type {
   CollapsibleFileContentProps,
   ContentSegment,
 } from './components/messages/CollapsibleFileContent';
+export { AskUserQuestionDialog } from './components/messages/AskUserQuestionDialog';
+export type {
+  AskUserQuestionDialogProps,
+  Question,
+  QuestionOption,
+} from './components/messages/AskUserQuestionDialog';
 
 // ChatViewer - standalone chat display component
 export {