fix: remove redundant fmt layer that outputs to hidden stdout

In production builds with windows_subsystem = "windows", stdout is suppressed.
The fmt::layer() was outputting to this hidden stdout, making logs invisible.

Now all tracing logs only go through TauriLogLayer to the debug console.

NOTE: There are still many println!/eprintln! calls throughout the codebase
that bypass tracing entirely. These should be gradually migrated to use
tracing::info!/tracing::error! macros for visibility in production builds.

src-tauri/src/lib.rs

@@ -63,9 +63,10 @@ pub fn run() {
         .manage(discord_rpc.clone())
         .setup(move |app| {
             // Initialize tracing with custom layer that emits to frontend
+            // NOTE: We don't use fmt::layer() because in production builds with windows_subsystem = "windows",
+            // stdout is hidden. Instead, all logs go through TauriLogLayer to the debug console.
             let tauri_layer = TauriLogLayer::new(app.handle().clone());
             tracing_subscriber::registry()
-                .with(tracing_subscriber::fmt::layer())
                 .with(tauri_layer)
                 .init();