refactor(core): reorganize module structure

core/src/error/kinds.rs

@@ -1,49 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/error/kinds.rs
-//
-// Central error types for Noctua.
-
-use std::fmt;
-
-pub type Result<T> = std::result::Result<T, Error>;
-
-#[derive(Debug)]
-pub enum Error {
-    /// A requested file or resource was not found.
-    NotFound(String),
-    /// The file format or operation is not supported.
-    Unsupported(String),
-    /// A rendering operation failed.
-    Render(String),
-    /// A session could not be loaded or saved.
-    Session(String),
-    /// An underlying I/O error.
-    Io(std::io::Error),
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Error::NotFound(msg) => write!(f, "Not found: {}", msg),
-            Error::Unsupported(msg) => write!(f, "Unsupported: {}", msg),
-            Error::Render(msg) => write!(f, "Render error: {}", msg),
-            Error::Session(msg) => write!(f, "Session error: {}", msg),
-            Error::Io(err) => write!(f, "I/O error: {}", err),
-        }
-    }
-}
-
-impl std::error::Error for Error {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
-        match self {
-            Error::Io(err) => Some(err),
-            _ => None,
-        }
-    }
-}
-
-impl From<std::io::Error> for Error {
-    fn from(err: std::io::Error) -> Self {
-        Error::Io(err)
-    }
-}