Add Live to Firebase AI sample app

[dlarocque]

Add a new entry in the right sidebar that allows users to use the Live Audio Conversation (startAudioConversation()) API.

[gemini-code-assist]

Summary of Changes

Hello @dlarocque, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new 'Live Audio Conversation' feature to the Firebase AI sample application. It allows users to engage in real-time voice interactions with an AI model by adding a dedicated UI mode, integrating the startAudioConversation() API, and providing a new view component to manage the live conversation experience.

Highlights

• New 'Live' Application Mode: A new 'live' mode has been introduced into the application's core AppMode type, enabling the integration of real-time audio conversation features.
• UI Integration: The user interface now includes a dedicated 'Live Conversation' option in the left sidebar, allowing users to easily access the new feature.
• Dedicated Live Conversation View: A new LiveView component has been added, which handles the logic and rendering for real-time audio conversations, including starting/stopping conversations and displaying status.
• Backend Model Configuration for Live Audio: The application now configures specific AI models for live conversations based on the chosen backend type (Google AI or Vertex AI), ensuring compatibility and optimal performance.

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[gemini-code-assist]

Code Review

This pull request successfully adds a new 'Live Conversation' feature to the application, introducing a LiveView component that utilizes the startAudioConversation API. The changes are well-structured, including updates to routing, state management, and UI components. My review focuses on improving robustness, state management, and code consistency. I've identified a potential runtime crash due to an unsafe type assertion, a state management issue that affects user experience, an instance of an unused prop, and an inconsistent hardcoded value in the CSS. Addressing these points will make the new feature more reliable and maintainable.