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

まず Usage セクションと、既存の全体的なトークン消費量の集計を見つけます。使用量がどのように記録・表示されているかを追跡し、次にモデルの識別情報と入力・出力・合計トークンの値をどこに表示できるかを特定します。ユーザーがこれら3つのメトリクスをモデル別に確認でき、既存の全体的な使用量も引き続き利用できれば完了です。