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

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "crane": {
       "locked": {
-        "lastModified": 1738652123,
-        "narHash": "sha256-zdZek5FXK/k95J0vnLF0AMnYuZl4AjARq83blKuJBYY=",
+        "lastModified": 1739936662,
+        "narHash": "sha256-x4syUjNUuRblR07nDPeLDP7DpphaBVbUaSoeZkFbGSk=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "c7e015a5fcefb070778c7d91734768680188a9cd",
+        "rev": "19de14aaeb869287647d9461cbd389187d8ecdb7",
         "type": "github"
       },
       "original": {
@@ -23,11 +23,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1738650687,
-        "narHash": "sha256-1tvCUR1+/F3IT1K4QHTcEO+vsip/P1iluPIttX57Ry8=",
+        "lastModified": 1740378829,
+        "narHash": "sha256-cwmm7F73aQFJY6YN1roNibNKwxT6FlfXkG3MEbpSp7Q=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "37a1f29ebf98fbbac667730edc5dab4ebe2e3954",
+        "rev": "92823f1b0c919d7e2d806956aaf98e90f3761ab7",
         "type": "github"
       },
       "original": {
@@ -56,11 +56,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1738546358,
-        "narHash": "sha256-nLivjIygCiqLp5QcL7l56Tca/elVqM9FG1hGd9ZSsrg=",
+        "lastModified": 1740367490,
+        "narHash": "sha256-WGaHVAjcrv+Cun7zPlI41SerRtfknGQap281+AakSAw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c6e957d81b96751a3d5967a0fd73694f303cc914",
+        "rev": "0196c0175e9191c474c26ab5548db27ef5d34b05",
         "type": "github"
       },
       "original": {
@@ -81,11 +81,11 @@
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1738591430,
-        "narHash": "sha256-Q4tPO6rH/q41IZG+NGy/Pjd2RW/bRDVjVjBh9LaVWE4=",
+        "lastModified": 1740329432,
+        "narHash": "sha256-eKQ7aBkNvF5AhUpyJ1cW450jxomZ4gTIaYir5qsNl7Y=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "13c17db07b1201e3c460b4cc0ee49ac4d0ace0e5",
+        "rev": "6d68c475c7aaf7534251182662456a4bf4216dfe",
         "type": "github"
       },
       "original": {