Feature: model switching mechanism

[browseros247-dev]

Feature: Model Switching Mechanism

Description

Implement a model switching mechanism that allows users to select and switch between available AI models.

Requirements

• Add a model selector to the UI.
• Display all supported/available models.
• Allow users to switch models without restarting the app.
• Preserve the current conversation/context when switching models, where supported.
• Clearly indicate the currently active model.
• Handle model switching failures gracefully.
• Provide a fallback model when the selected model is unavailable.
• Persist the user's selected model across app sessions.

Acceptance Criteria

• Users can view available AI models.
• Users can switch between models from the UI.
• The active model is clearly indicated.
• Switching models does not crash or restart the app.
• Conversation context is preserved where technically possible.
• The selected model persists after restarting the app.
• Appropriate error handling is implemented for unavailable/failed models.
• A fallback model is used when configured and necessary.

Expected Behavior

When the user selects a different model, subsequent AI requests should be processed using the newly selected model while maintaining the existing application state and conversation context whenever possible.