add improve prompt button to task block and action block (#4020)

skyvern-frontend/src/components/ImprovePrompt.tsx

@@ -25,7 +25,7 @@ import { useCredentialGetter } from "@/hooks/useCredentialGetter";
 import { ImprovePromptForWorkflowResponse } from "@/routes/workflows/types/workflowTypes";
 
 interface Props {
-  context?: string;
+  context?: Record<string, unknown>;
   isVisible?: boolean;
   onBegin?: () => void;
   onEnd?: () => void;

skyvern-frontend/src/components/WorkflowBlockInputTextarea.tsx

@@ -10,7 +10,7 @@ import { useDebouncedCallback } from "use-debounce";
 import { ImprovePrompt } from "./ImprovePrompt";
 
 interface AiImprove {
-  context?: string;
+  context?: Record<string, unknown>;
   useCase: string;
 }