Implement ScoreListWidget to manage score list rendering and execution confirmation flow. This includes methods for scrolling through scores, launching an execution, confirming/denying the execution, and rendering a popup for user confirmation.
Update the `Score` trait implementations to return a `Box<dyn Interpret>` instead of concrete types or clones where necessary. Additionally, refactor the initialization and cleanup in `HarmonyTUI` to use utility functions provided by `ratatui`.
Add a new `harmony_tui` crate to initialize and run a text-based user interface (TUI) for the Harmony project using `ratatui` for rendering and `crossterm` for handling input. The `HarmonyTUI` struct initializes the terminal, enters a loop to render updates, and handles basic input events to exit. This commit sets up the foundation for further TUI development.
