Rust 1.85.0 + Rust 2024 Edition (#68)

- Add `rust-toolchain.toml`
- Refactor `flake` to consider `rust-toolchain.toml`, especially Rust version
- `just`: Add run-sound command
- Ignore sound files
- Format

src/terminal.rs

@@ -5,7 +5,7 @@ use crossterm::{
     cursor, execute,
     terminal::{EnterAlternateScreen, LeaveAlternateScreen},
 };
-use ratatui::{backend::CrosstermBackend, Terminal as RatatuiTerminal};
+use ratatui::{Terminal as RatatuiTerminal, backend::CrosstermBackend};
 
 pub type Terminal = RatatuiTerminal<CrosstermBackend<io::Stdout>>;