Summary: Overlay adds new AI models

Why It Matters: Overlay now supports more AI models. This gives users more choices.

What Changed:

• The list of supported AI models was updated.
• The "How It Works" section for configuring AI models was updated to list the new models.
• The "Overlay AI Assistant" image and text were removed.
• The browser availability section was updated to show Chrome, Firefox (Coming Soon), and Edge.