Model Update & Version Control

[MitPete]

As a user, I want the extension to automatically check for AI model updates so that I always have the latest improvements.

✅ Acceptance Criteria

• The extension should check for model updates periodically.
• If a new model is available, prompt the user to download it.
• Provide an option to manually trigger a model update.
• Show version information for the current model.

📌 Tasks

• Implement periodic model update checks in the background script.
• Display the current model version in the settings UI.
• Provide an option for users to manually update the model.
• Ensure users are notified before downloading a new model.

📝 Notes

• Maintain backward compatibility with older models.
• Use IndexedDB to store model metadata (version info, update history).