a second instance on one machine: its own data, its own peer port, and a join that says itself again when it was never seated

src-tauri/src/pipeline.rs

@@ -141,7 +141,7 @@ pub fn init(app: &tauri::AppHandle) -> Result<(), String> {
     // AppData keeps only what is about the APP on THIS machine — the cache of
     // remote provider responses. Everything describing the LIBRARY lives in
     // the library folder so it travels with the music.
-    let app_dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
+    let app_dir = crate::paths::app_data(app).map_err(|e| e.to_string())?;
     std::fs::create_dir_all(&app_dir).map_err(|e| e.to_string())?;
 
     let cfg = crate::config::load(app);