refactor: introduce write_todos tool for enhanced task management

- Added a new write_todos tool to facilitate the creation and management of planning lists within the chat interface.
- Updated system prompt with detailed instructions on using the write_todos tool, including usage patterns and restrictions.
- Enhanced the chat message handling to support the new tool, ensuring proper integration and user experience.
- Implemented UI components for displaying and interacting with the planning lists, including progress tracking and status indicators.

surfsense_web/components/tool-ui/index.ts

@@ -60,3 +60,17 @@ export {
 	type ScrapeWebpageResult,
 	ScrapeWebpageToolUI,
 } from "./scrape-webpage";
+export {
+	Plan,
+	PlanErrorBoundary,
+	type PlanProps,
+	parseSerializablePlan,
+	type SerializablePlan,
+	type PlanTodo,
+	type TodoStatus,
+} from "./plan";
+export {
+	WriteTodosToolUI,
+	type WriteTodosArgs,
+	type WriteTodosResult,
+} from "./write-todos";