Parity with the classic CLI status bar (PR #18579). The Python backend
already exposes 'compressions' on SessionUsageResponse; this wires it
through the Ink Usage type and renders 'cmp N' next to the duration
segment of StatusRule.
- types.ts Usage: add optional compressions field
- appChrome.tsx StatusRule: render 'cmp N' when > 0, color-tiered by
pressure (muted <5, warn 5-9, error 10+)
- Plain text 'cmp' token (no emoji) matches PR #18579's original author
rationale and avoids Ink layout drift from VS16 emoji width
3a82172dd5