fix: restore /1M, /d labels and spacing for readability

feat: compact layout — shorter bar, tighter spacing, no model context suffix

feat: visual overhaul — fine-grained bar, better layout, human-readable duration

feat: show plan usage (5h + 7d rate limits with reset countdown)

chore: change default cost decimals from 4 to 2

feat: configurable cost decimal places (default: 4)

Initial release: Claude Code usage monitor plugin