fix: resolve runtime crashes in tool-ui components and backend import errors

Backend:
- Remove dead imports (display_image, link_preview, knowledge_base) from tools registry and __init__
- Delete orphaned elif chain (lines 784-1046) in knowledge_base.py left after asyncio.gather refactor
- Add missing NotionAPIError class to notion_history.py

Frontend:
- Add display-image.tsx, link-preview.tsx, scrape-webpage.tsx tool UI components
- Fix GeneratePodcastToolUI: add null guard for no-props render + optional chaining on status/args
- Fix SaveMemoryToolUI/RecallMemoryToolUI: add null guard when rendered without props in provider
- Update launch.json to use pnpm on port 3999

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

surfsense_backend/app/connectors/notion_history.py

@@ -8,6 +8,10 @@ from notion_client.errors import APIResponseError
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.future import select
 
+
+class NotionAPIError(Exception):
+    """Raised when Notion API returns an error response."""
+
 from app.config import config
 from app.db import SearchSourceConnector
 from app.schemas.notion_auth_credentials import NotionAuthCredentialsBase