Desktop & Mobile Personal Assistant

I have a simple proof-of-concept running at https://personal-assistance-laptop-assistant-938098220572.asia-southeast1.run.app/ and now want to turn it into a polished personal-assistance web application that feels equally natural on a laptop or a phone.

Here is what I need:
• A clean, responsive interface that automatically adapts between desktop and mobile breakpoints without losing any functionality.
• Core “assistant” logic rewritten or refined so new tasks can be plugged in easily (for example scheduling or quick information look-ups down the line, although the first milestone can focus on a solid scaffolding and one showcase task).
• Secure user authentication plus a lightweight settings area so each user can fine-tune preferences.
• Deployment back to the same Cloud Run URL, along with a short README explaining how to build and redeploy.

Tech stack is open: I prototyped in Node/Express, but I’m happy with React, Vue, SvelteKit, or even a Python-based solution if you can keep startup time low on Cloud Run. Whatever you choose, please include TypeScript typing or equivalent safeguards, unit tests for any helper libraries, and clear separation between UI and assistant engine.

Acceptance will be based on:
1. Zero layout breakage when switching between a 1280-px desktop window and a 375-px mobile viewport.
2. Assistant responds within two seconds on a cold start and under one second thereafter.
3. Code passes the README build steps without modification.

Let me know which framework you’d prefer and a rough timeline for the first production push.