many changes

src-tauri/src/player/mpv_backend_test.rs

@@ -4,6 +4,8 @@
 /// - Tokio runtime panics when spawning async tasks from std::thread
 /// - Position update thread failures
 /// - Event emission issues
+///
+/// TRACES: UR-003, UR-004 | IR-003 | IT-003, IT-004
 
 #[cfg(test)]
 mod tests {