Better usage stats

Feature Description

Currently, the Usage section shows overall token consumption, but it doesn't provide a breakdown by model.

It would be very helpful to include per-model token usage (input, output, and total tokens) so users can:

• Identify which models are consuming the most tokens.
• Better estimate and optimize costs.
• Compare usage across different models.
• Debug unexpected token spikes from specific models or workflows.

This would be especially useful for users who frequently switch between multiple models or providers within the same project.

Use Case

No response

Additional Context

No response

How important is this to you?

Nice to have

首先定位 Usage 區段以及現有的整體 token 消耗彙總。追蹤使用量的記錄與顯示方式，然後確定可以在哪裡呈現模型識別資訊，以及輸入、輸出和總 token 值。完成的標準是使用者可以依模型查看這三項指標，同時現有的整體使用量仍然可用。