Complete UI Overhaul and Feature Implementation

[ElliotBadinger]

Summary

This pull request addresses user feedback by performing a complete overhaul of the Echo application. It introduces a modern, professional user interface based on Material You principles, adds significant new functionality, and dramatically improves the user experience.

All changes are based on the detailed plan outlined in the new spec.md file.

Key Improvements:

• Modern UI/UX: Replaced the entire visual theme with a professional, high-contrast design. Redesigned all screens and dialogs with modern layouts and components.
• New Features: Implemented a user-requested auto-save feature and added a clear visual indicator for the app's listening status.
• Code Health: Performed a full refactoring of the associated Java code, resulting in a cleaner and more maintainable codebase.
• Documentation: Added a new professional README.md and a spec.md for future development.

This PR resolves all outstanding UI/UX issues and delivers a significantly more polished and feature-rich application.

🤖 Generated with Claude Code