Qt GUI utility library providing base classes for MDI windows, tree/list/table views, model items, dialogs, settings persistence, and custom widgets.

Key Classes

Class	Description
`MainWindowBase`	QMainWindow base with position/size persistence and font management
`MdiWindow`	MDI container with sub-window lifecycle management
`MdiSubWindow`	QMdiSubWindow wrapper with type tagging and geometry persistence
`TreeViewBase`	QTreeView with header state persistence, column settings, and search
`ListView`	QListView with proxy model support and UUID-based selection
`AbstractItemModel`	QAbstractItemModel base with UUID lookup and column header management
`AbstractModelItem`	Tree item base with entity metadata, icons, and parent/child hierarchy
`ComplexWidget`	QWidget base with validation signal wiring and settings persistence
`GuiSettings`	Singleton for persisting window geometry, header state, and preferences
`StatusBar`	Custom status bar with animated progress messages
`PushButton`	QPushButton with stylesheet-based color and font customization

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