Add 'CenterOnCursor' command and improve cursor scrolling logic

- Introduced `CommandId::CenterOnCursor` to center viewport on the cursor line.
- Improved scrolling behavior in `ImGuiRenderer` to avoid aggressive centering and keep visible lines stable.
- Updated `make-app-release` to rename the output app to `kge-qt.app`.
- Adjusted padding in `ImGuiFrontend` to align with `ImGuiRenderer` settings for consistent scrolling.
- Bumped version to 1.4.1.

make-app-release

@@ -20,9 +20,10 @@ cmake -S . -B cmake-build-release -DBUILD_GUI=ON -DCMAKE_BUILD_TYPE=Release -DEN
 
 cd cmake-build-release-qt
 make clean
-rm -fr kge.app*
+rm -fr kge.app* kge-qt.app*
 make
-zip -r kge.app.zip kge.app 
-sha256sum kge.app.zip
+mv kge.app kge-qt.app
+zip -r kge-qt.app.zip kge-qt.app 
+sha256sum kge-qt.app.zip
 open .
 cd ..