- rename window base class usage to BaseModalWindow and update modal method calls
- add persistent CustomDataSettingsWindow instance to CreateCollectionMenu
- prepare custom data collection dynamically before showing the settings window
- apply custom data to AppState without immediately replacing mainCollection
- create mainCollection from prepared custom student data
- replace student preview message with collection preview window
- update input validation and StudentBuilder state handling
- rename collection-related methods and variables for clearer semantics
Add support for storing and configuring custom student data
collections in AppState.
Introduce a custom data settings window for entering and validating
student fields, selecting an object index, previewing student data,
and applying prepared data to the current collection.
Refactor collection creation to use reusable input handling and
update collection display and message window usage.
debug-version