Add language defaults for first-run experience and introduce Qt tool command wrapper

This commit sets default languages to English for the application unless the user specifies a different language, ensuring a consistent first-run experience across different system locales. Additionally, a wrapper for Qt tools is introduced in the CMake configuration for non-Windows platforms to filter out non-actionable output during builds.

src/main.cpp

@@ -283,6 +283,13 @@ int main(int argc, char *argv[]) {
     }
   }
 
+  // Default to English unless the user explicitly selected a language (CLI or settings).
+  // This makes the first-run experience deterministic across system locales.
+  if (languages.isEmpty()) {
+    languages << u"en_US"_s;
+    languages << u"en"_s;
+  }
+
   // Use system UI languages
   if (languages.isEmpty()) {
 #  if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)