Context window usage hint instead of plan usage?

Hi, I use /compact a lot to avoid context window issues and I have one suggestion:

The plan usage hint:

Is nearly useless for us company employees I think, the limit is quite large and the UI never shows any useful value (at least for me).

What is very much useful though is the context window usage, I always keep clicking and expanding in the "session details" view at the top:

From there I can see the current context window usage and what components are using what portion, in order to decide if it's good time to invoke compact or rather start another session etc.
It would be awesome if we could configure the app to replace the wasted plan usage hint with context window hint. It can carry the same information as in the details block by rendering as a multiple-colored-sections circle, ie. we'd know at a glance how much we consumed for messages, how much is free space etc. mouse hover would then give us same info as in the session details pane.

首先检查 issue 中描述的计划使用量提示和会话详情视图，然后追踪其中显示的使用量数据来源。确定应用如何在提示中展示上下文窗口使用量，以及替换内容是否应当可配置。完成的标准是：提示显示所请求的上下文使用量明细，并支持所述交互。

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