I would like to have "credits consumption" stats page, where I can see how mu...

I would like to have "credits consumption" stats page, where I can see how much ai credits I consume over time and more stats on how much different sessions take. So I get more insights into how I spend my credits.

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| Field | Value |
| --- | --- |
| App version | 1.0.18 |
| OS | macOS 15.7.7 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 1 |

从 GitHub Copilot 应用中的 /chat 体验入手，确定 credit 使用量和会话信息的展示位置。Done 应提供一个 credit 消耗统计页面，展示一段时间内的使用情况以及各会话之间的对比消耗，并在实现前明确预期的指标和呈现方式。

由索引模型根据 Issue 内容生成。