Decouple core Yaak logic from Tauri (#354)

crates-tauri/yaak-fonts/src/error.rs

@@ -0,0 +1,15 @@
+use serde::{ser::Serializer, Serialize};
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {}
+
+impl Serialize for Error {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(self.to_string().as_ref())
+    }
+}
+
+pub type Result<T> = std::result::Result<T, Error>;