Remove redundant code constructs and prefer concise, direct patterns that improve readability and maintainability. This includes eliminating unnecessary widget/layout creation, using ternary operators for simple conditionals, direct initialization patterns, and simplifying complex calculations with named constants. Examples of improvements: - Instead of creating wrapper widgets unnecessarily: `routes_type_selector_->addTab(preserved_route_list_ = new RouteListWidget, tr("&Preserved"));` - Use ternary operators for simple conditionals: `return routes_type_selector_->currentIndex() == 0 ? route_list_ : preserved_route_list_;` - Direct layout attachment: `auto layout = new QVBoxLayout(widget)` instead of separate `setLayout()` calls - Replace complex calculations with named constants: `const QColor ENGAGED_COLOR = QColor::fromRgbF(0.1, 0.945, 0.26);` instead of inline math - Eliminate unnecessary variable assignments and prefer direct initialization where possible This approach reduces code bloat, makes intent clearer, and improves maintainability by removing opportunities for errors in redundant code paths.