Feature: Option to show global account usage in statusline

Feature Request

Current behavior:
The statusline shows session-level usage percentage (e.g., [3% session]), which tracks tokens used in the current CLI session.

Requested behavior:
Add an option to display global account usage percentage in the statusline instead of (or in addition to) session usage.

Rationale:

• The /status command already has access to global usage data (visible in the usage tab)
• Users may find global account usage more relevant for tracking their overall consumption
• This would provide consistency between the statusline and what's shown on claude.ai/settings/usage

Suggested implementation:
A configuration option to choose between:

• Session usage (current default)
• Global/account usage
• Both

Thank you!