d1rshan/taskflow — reverse-engineered prompt

Build me a web app called TaskFlow using the existing TypeScript Next.js project. I want users to sign up, log in, and manage their own visual workflows from a clean dashboard.

The main thing should be a drag and drop workflow editor where someone can create task pipelines by connecting nodes together. Include basic trigger nodes like webhooks, action nodes for API calls, and AI nodes that can use OpenAI, Anthropic, or Google when the user adds the right keys. Users should be able to save workflows, run them, and see the execution status update while it runs, including success and failure details.

Please wire it to a Postgres database, add authentication, and make the execution reliable with the workflow runner already intended for this project. Keep the UI modern and simple, with clear empty states and helpful error messages. Add the needed env example and setup notes so I can run it locally. Look up current docs online if you need to.