Replit Productivity App Cleanup

I have a working productivity app that I built on Replit, but it needs enhancemetns and corrections. I’d like an experienced developer to step in, review the existing codebase, and give the project a thorough tidy-up focused on UI/UX problems.

Here’s what I need:
- Audit the current HTML/CSS/JS (and any supporting Python or Node modules I’m using) and reorganise messy sections so the code is readable and maintainable.
- Diagnose and fix visual glitches, alignment issues, and any interactive elements that fail or feel sluggish.
- Make sure pages scale nicely on desktop, tablet and mobile; responsive design is essential.
- Streamline assets or API calls that may be slowing down screen transitions.
- Walk me through the key changes in a short hand-over document or Loom video so I understand how to keep things clean going forward.

Acceptance criteria: the main dashboard, task editor, and settings pages load without layout breaks on Chrome, Firefox, Safari and a modern mobile browser; all buttons, modals and drag-and-drop features work smoothly; Lighthouse audit scores at least 90 for performance and accessibility.

You’ll have full access to the Replit workspace and its built-in deployment environment, so no local setup headaches. If you have experience using Replit’s version control and deployment buttons, even better. Let me know your approach and a realistic turnaround time, and we can get started right away.