fix: spawn.log ghi vao %APPDATA%/SonicForgeDAW/logs (thu muc luon ton tai) — engine_dir co the khong duoc bundle vao installer

src-tauri/src/lib.rs

@@ -25,17 +25,28 @@ pub fn run() {
             } else {
                 engine_dir.join("daw_engine")
             };
-            // Ghi log spawn de chan doan (UI khong duoc panic/thoat — chi log)
+            // Ghi log spawn de chan doan (UI khong duoc panic/thoat — chi log).
+            // Ghi vao %APPDATA%/SonicForgeDAW/logs/spawn.log (thu muc luon ton
+            // tai) — KHONG ghi vao engine_dir vi thu muc do co the khong duoc
+            // bundle vao installer (resources loi) -> ghi am tham that bai.
+            let log_dir = std::env::var("APPDATA").unwrap_or_else(|_| ".".into());
+            let spawn_log_path = std::path::Path::new(&log_dir)
+                .join("SonicForgeDAW")
+                .join("logs")
+                .join("spawn.log");
+            if let Some(parent) = spawn_log_path.parent() {
+                let _ = std::fs::create_dir_all(parent);
+            }
             let log_line = format!(
-                "spawn daw_engine: {} exists={}\n",
+                "spawn daw_engine: {} exists={}\nresource_dir={}\n",
                 engine_exe.display(),
-                engine_exe.exists()
+                engine_exe.exists(),
+                res_dir.display()
             );
-            if let Some(mut f) = std::fs::OpenOptions::new()
+            if let Ok(mut f) = std::fs::OpenOptions::new()
                 .create(true)
                 .append(true)
-                .open(engine_dir.join("spawn.log"))
+                .open(&spawn_log_path)
-                .ok()
             {
                 use std::io::Write;
                 let _ = f.write_all(log_line.as_bytes());