Display real-time session and context metrics to improve user awareness, cost control.

Feature Description

The TUI should display the following information in a visible and accessible section (e.g., below the chat box or at the top):

Context Usage

• Current context usage vs total available context (e.g., 12K / 32K tokens)

Token Metrics

• Total input tokens
• Total output tokens
• Cached tokens (if applicable)

Cost Tracking

• Total cost incurred during the session (in $)

Time metrics

• Total time elapsed for each step/message in a conversation
• Time elapsed since the session started or last reset

Use Case

• Helps users monitor context limits
• Improves cost transparency and control
• Enables users to decide when to start a fresh session instead of continuing with an overloaded one

Additional Context

No response

How important is this to you?

None

从 TUI 的聊天和会话显示开始，然后追踪现有的逐条消息响应数据，以获取上下文、令牌、成本和时间值。定义应如何显示会话总计和每步耗时，并验证显示内容会在对话过程中更新，并在新会话开始时重置。