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_backend/app/agents/new_chat/tools/registry.py

@@ -48,6 +48,7 @@ from .knowledge_base import create_search_knowledge_base_tool
 from .link_preview import create_link_preview_tool
 from .podcast import create_generate_podcast_tool
 from .scrape_webpage import create_scrape_webpage_tool
+from .write_todos import create_write_todos_tool
 
 # =============================================================================
 # Tool Definition
@@ -125,6 +126,13 @@ BUILTIN_TOOLS: list[ToolDefinition] = [
         ),
         requires=[],  # firecrawl_api_key is optional
     ),
+    # Planning/Todo tool - creates visual todo lists
+    ToolDefinition(
+        name="write_todos",
+        description="Create a planning/todo list to break down complex tasks",
+        factory=lambda deps: create_write_todos_tool(),
+        requires=[],
+    ),
     # =========================================================================
     # ADD YOUR CUSTOM TOOLS BELOW
     # =========================================================================