The SkillTreeViewModel class serves as the view model for the skill tree and extends Flutter's ChangeNotifier for state management.
Features include:
- Storing and managing the list of SkillTreeNodes and SkillTreeEdges.
- Managing the state of the selected node.
- Initializing the skill tree with predefined nodes and edges.
- Methods for toggling node selection, allowing for only a single node to be selected at any given time.
The view model utilizes the GraphView package for visualization and layout.
Added a new state variable `_isContinuousMode` to the ChatViewModel to track whether the chat is in continuous mode or not. This state is toggled via a setter and triggers UI updates through `notifyListeners()`.
Enhanced the `sendChatMessage` method to automatically send a null message if continuous mode is active, triggering the next step in the chat.
