refactor: improve write_todos tool and UI components

- Refactored the write_todos tool to enhance argument and result schemas using Zod for better validation and type safety.
- Updated the WriteTodosToolUI to streamline the rendering logic and improve loading states, ensuring a smoother user experience.
- Enhanced the Plan and TodoItem components to better handle streaming states and display progress, providing clearer feedback during task management.
- Cleaned up code formatting and structure for improved readability and maintainability.

surfsense_backend/app/agents/new_chat/tools/write_todos.py

@@ -5,7 +5,7 @@ This module provides a tool for creating and displaying a planning/todo list
 in the chat UI. It helps the agent break down complex tasks into steps.
 """
 
-from typing import Any, Literal
+from typing import Any
 
 from langchain_core.tools import tool
 
@@ -91,4 +91,3 @@ def create_write_todos_tool():
         }
 
     return write_todos
-

surfsense_backend/app/connectors/webcrawler_connector.py

@@ -76,12 +76,17 @@ class WebCrawlerConnector:
                     return result, None
                 except Exception as firecrawl_error:
                     # Firecrawl failed, fallback to Chromium
-                    logger.warning(f"[webcrawler] Firecrawl failed, falling back to Chromium+Trafilatura for: {url}")
+                    logger.warning(
+                        f"[webcrawler] Firecrawl failed, falling back to Chromium+Trafilatura for: {url}"
+                    )
                     try:
                         result = await self._crawl_with_chromium(url)
                         return result, None
                     except Exception as chromium_error:
-                        return None, f"Both Firecrawl and Chromium failed. Firecrawl error: {firecrawl_error!s}, Chromium error: {chromium_error!s}"
+                        return (
+                            None,
+                            f"Both Firecrawl and Chromium failed. Firecrawl error: {firecrawl_error!s}, Chromium error: {chromium_error!s}",
+                        )
             else:
                 # No Firecrawl API key, use Chromium directly
                 logger.info(f"[webcrawler] Using Chromium+Trafilatura for: {url}")