- Introduced `is_builtin` property in the model configuration to identify builtin models.
- Updated frontend components to display a tag for builtin models in the ModelSelector and ModelSettings.
- Enhanced the ModelEditorDialog to prevent editing and deletion of builtin models.
- Implemented logic in the backend to hide sensitive information for builtin models and restrict their modification.
- Added informative UI elements to clarify the nature of builtin models in the settings and editor views.
- Added theme initialization and management in the UI store.
- Enhanced dark mode styles for various components, including tables, dialogs, and inputs.
- Updated multiple components to use CSS variables for consistent theming.
- Introduced a new simplified API for updating knowledge base configurations.
- Improved overall UI consistency and responsiveness with new styles.
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