AspireCalc/MantraCode ? reverse-engineered prompt

Build me a terminal based AI coding assistant that feels polished and easy to use. I want a chat style interface inside the command line where I can ask it to inspect my project, explain what it finds, and then switch into a more powerful mode where it can actually edit files and run commands for me. It should support a safe read only planning mode and a build mode that can make changes, run tests, and keep working through tasks in my workspace.

I also want login through the browser, saved sessions I can reopen later, and a simple way to switch models and themes from inside the app. Make the output look nice in the terminal, with readable markdown, code highlighting, and clear diffs when files change. If needed, look up current docs online so the implementation matches modern tooling.