Token usage display: show per-call and session cumulative total

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Current behaviour

The status line shows a single indicator reflecting current context usage.

## Desired behaviour
Display values such as:
last: 2k | session: 100k | today: 500k

Proposed Solution

The current token usage indicator shows context window usage but it would be
useful to see both:

• Per-call tokens: tokens used in the last call (e.g. 2k)
• Session total: cumulative tokens used across the entire session (e.g. 100k total)
• Daily total: cumulative tokens used today across all sessions (e.g. 500k today)

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_