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/events.rs

@@ -3,7 +3,7 @@ use futures::{Stream, StreamExt};
 use std::{pin::Pin, time::Duration};
 use tokio::sync::mpsc;
 use tokio::time::interval;
-use tokio_stream::{wrappers::IntervalStream, StreamMap};
+use tokio_stream::{StreamMap, wrappers::IntervalStream};
 
 use crate::common::ClockTypeId;
 use crate::constants::{FPS_VALUE_MS, TICK_VALUE_MS};