many changes

src-tauri/src/player/backend.rs

@@ -232,14 +232,13 @@ impl PlayerBackend for NullBackend {
     }
 }
 
+// TRACES: UR-003, UR-004 | DR-004 | UT-026, UT-027, UT-028, UT-029, UT-030, UT-031, UT-032, UT-033
 #[cfg(test)]
 mod tests {
     use super::*;
 
     /// Test NullBackend volume default value
-    ///
-    /// @req-test: UT-026 - NullBackend volume default value
-    /// @req-test: DR-004 - PlayerBackend trait
+    /// TRACES: UR-016 | DR-004 | UT-026
     #[test]
     fn test_null_backend_volume_default() {
         let backend = NullBackend::new();