chore: add derive_more and smart-default crates

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/modes/info.rs

@@ -47,7 +47,7 @@ pub fn mode_info(
     show_item(item_with_meta, settings, data_path)
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize)]
 struct ItemInfo {
     id: i64,
     timestamp: String,

src/services/error.rs

@@ -24,11 +24,24 @@ pub enum CoreError {
     Other(#[from] anyhow::Error),
 }
 
-impl From<rusqlite_migration::Error> for CoreError {
-    fn from(err: rusqlite_migration::Error) -> Self {
-        match err {
-            rusqlite_migration::Error::RusqliteError { err: e, .. } => CoreError::Database(e),
-            e => CoreError::Other(e.into()),
-        }
-    }
+use derive_more::From;
+
+#[derive(Error, Debug, From)]
+pub enum CoreError {
+    #[error("Database error: {0}")]
+    Database(#[from] rusqlite::Error),
+    #[error("I/O error: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("Item not found with id {0}")]
+    ItemNotFound(i64),
+    #[error("Item not found")]
+    ItemNotFoundGeneric,
+    #[error("Invalid input: {0}")]
+    InvalidInput(String),
+    #[error("Compression error: {0}")]
+    Compression(String),
+    #[error(transparent)]
+    Other(#[from] anyhow::Error),
+    #[from]
+    Migration(#[error(ignore)] rusqlite_migration::Error),
 }