fix(ui): restore qfluentwidgets import-time banner suppression

The lazy __getattr__ refactor (3d0d522) dropped the redirect_stdout wrapper around the qfluentwidgets import, so its promo banner printed to the console again. Warm-import the library with stdout redirected before application loads.

Author: vagabondHustler

src/subsearch/ui/__init__.py

@@ -5,7 +5,16 @@
 
 def __getattr__(name: str) -> Any:
     if name == "open_settings_window":
+        _import_qfluentwidgets_silently()
         from subsearch.ui.application import open_settings_window
 
         return open_settings_window
     raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+
+
+def _import_qfluentwidgets_silently() -> None:
+    import contextlib
+    import io
+
+    with contextlib.redirect_stdout(io.StringIO()):
+        import qfluentwidgets  # noqa: F401  (suppresses the library's import-time promo banner)