fix: register Linear tools in TOOLS_WITH_UI and make GraphQL calls async

- Add create_linear_issue, update_linear_issue, delete_linear_issue to
  TOOLS_WITH_UI so the HIL approval cards are correctly dispatched to
  the Linear tool-ui components (without this the interrupt cards were
  never rendered)
- Replace blocking requests.post with httpx.AsyncClient in
  LinearConnector.execute_graphql_query to avoid stalling the asyncio
  event loop during live streaming; remove now-unused requests import

surfsense_web/app/dashboard/[search_space_id]/new-chat/[[...chat_id]]/page.tsx

@@ -148,6 +148,9 @@ const TOOLS_WITH_UI = new Set([
 	"scrape_webpage",
 	"create_notion_page",
 	"update_notion_page",
+	"create_linear_issue",
+	"update_linear_issue",
+	"delete_linear_issue",
 	// "write_todos", // Disabled for now
 ]);