test(startup): isolate Windows focusability transition (#37)

- Issue #37: keep the failing startup path hidden and focused-out while removing the post-Ready focusability transition.\n- Use the packaged workflow to distinguish native focusability from other startup causes.\n\nRefs #37.

scripts/smoke-packaged-app.js

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

src-tauri/src/lib.rs

@@ -3996,9 +3996,6 @@ fn mark_main_window_startup_complete(app_handle: &tauri::AppHandle) {
 #[cfg(target_os = "windows")]
 fn reveal_main_window(app_handle: &tauri::AppHandle) {
     if let Some(window) = app_handle.get_webview_window("main") {
-        if let Err(error) = window.set_focusable(true) {
-            log::warn!("Could not make the main window focusable: {error}");
-        }
         if let Err(error) = window.show() {
             eprintln!("Failed to reveal the main window: {error}");
         }
@@ -18558,8 +18555,7 @@ pub fn run() {
                 // re-enter that handler during native construction.
                 main_window_builder = main_window_builder
                     .visible(false)
-                    .focused(false)
-                    .focusable(false);
+                    .focused(false);
             }
             main_window_builder
                 .build()
@@ -18854,9 +18850,6 @@ 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 {