refactor(repo): promote tauri app to repository root

src-tauri/src/error.rs

@@ -0,0 +1,33 @@
+use serde::Serialize;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum AppError {
+    #[error("IO error: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("Network error: {0}")]
+    Reqwest(#[from] reqwest::Error),
+    #[error("Internal error: {0}")]
+    Internal(String),
+}
+
+impl Serialize for AppError {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(&self.to_string())
+    }
+}
+
+impl From<String> for AppError {
+    fn from(s: String) -> Self {
+        AppError::Internal(s)
+    }
+}
+
+impl From<&str> for AppError {
+    fn from(s: &str) -> Self {
+        AppError::Internal(s.to_string())
+    }
+}