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/shared/schema.ts

@@ -0,0 +1,24 @@
+import { z } from "zod";
+
+/**
+ * Shared action schema for tool UI components
+ */
+export const ActionSchema = z.object({
+  id: z.string(),
+  label: z.string(),
+  variant: z.enum(["default", "secondary", "destructive", "outline", "ghost", "link"]).optional(),
+  disabled: z.boolean().optional(),
+});
+
+export type Action = z.infer<typeof ActionSchema>;
+
+/**
+ * Actions configuration schema
+ */
+export const ActionsConfigSchema = z.object({
+  confirm: ActionSchema.optional(),
+  cancel: ActionSchema.optional(),
+});
+
+export type ActionsConfig = z.infer<typeof ActionsConfigSchema>;
+