chore: source app display name from platform config

linux/runner/my_application.cc

@@ -31,7 +31,10 @@ static void my_application_activate(GApplication* application) {
   // out of place and noticeably thicker than the native title bar. Relying on
   // the compositor gives the native Breeze/KWin decoration on Plasma, and the
   // desktop's own title bar everywhere else.
-  gtk_window_set_title(window, "KiriMemo");
+  // The title comes from APPLICATION_TITLE in linux/CMakeLists.txt (passed as a
+  // preprocessor definition by linux/runner/CMakeLists.txt), so the name lives
+  // in the project configuration instead of being duplicated here.
+  gtk_window_set_title(window, APPLICATION_TITLE);
 
   gtk_window_set_default_size(window, 1280, 720);