refactor: server: use thiserror

crates/server/Cargo.toml

@@ -41,6 +41,7 @@ warp = { workspace = true }
 
 # boilerplate
 derive_more = { workspace = true }
+thiserror = { workspace = true }
 
 # file watcher
 inotify = { workspace = true }

crates/server/src/actors/file_watcher.rs

@@ -15,11 +15,11 @@ pub struct WatchFile;
 #[rtype(result = "()")]
 pub struct FileUpdated;
 
-#[derive(Debug, derive_more::From, derive_more::Display)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
-    Io(std::io::Error),
+    #[error("io")]
+    Io(#[from] std::io::Error),
 }
-impl std::error::Error for Error {}
 
 pub struct FileWatcher {
     path: PathBuf,