Add short descriptions for each AI model

Anuma offers a wide range of advanced AI models, but first-time and casual users may not know which model is best for their specific task.

It would be helpful to add a tooltip, info icon, or short description for each model explaining its strengths and best use cases, such as coding, creative writing, logical reasoning, speed, research, or general chat.

Why it matters:
Clear model guidance would help users choose the right tool faster, get better results, and feel more confident using Anuma.