- Add a new `useCameraPreview` hook for managing camera access and video stream handling.
- Integrate camera preview capabilities into the AssistantPage, allowing users to toggle video stream visibility.
- Introduce a new toggle for enabling visual understanding, which activates the video stream preview alongside voice functionalities.
- Update the DebugDrawer component to support switching between chat and video views based on the visual understanding setting.
- Refactor related components to accommodate the new camera features and improve user interaction during debugging.
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