test(startup): isolate Aria2 WebSocket crash path (#37)

- Issue #37: add a smoke-only switch that stops the Aria2 WebSocket loop.\n- Keep the daemon and poller paths active for a focused delayed-startup comparison.\n\nRefs #37.

scripts/smoke-packaged-app.js

@@ -29,7 +29,8 @@ const child = spawn(executable, [], {
   detached: process.platform !== 'win32',
   env: {
     ...process.env,
-    FIRELINK_SMOKE_TEST: '1',
+  FIRELINK_SMOKE_TEST: '1',
+  FIRELINK_DISABLE_ARIA2_WEBSOCKET: '1',
     WEBKIT_DISABLE_COMPOSITING_MODE: '1',
     GDK_BACKEND: 'x11',
   },

src-tauri/src/lib.rs

@@ -18854,6 +18854,9 @@ pub fn run() {
                     }
                 }
 
+                if std::env::var_os("FIRELINK_DISABLE_ARIA2_WEBSOCKET").is_some() {
+                    return;
+                }
                 let mut ws_retries = 0;
                 loop {
                     if ws_retries == 10 {