Update CLI version in README

feat: dark theme with purple palette, fix cost breakdown accuracy

fix theme

fix price

fix: migration 5 recalculates costs from steps with correct cache pricing

chore: republish with correct 0.1.20 version in bundle (server 0.1.18, cli 0.1.21)

feat: translate entire UI to English

docs: rewrite README in English with install/update instructions

fix: sync button uses hash-based skip (fast), migration invalidates once

feat: cost breakdown card in dashboard with cache pricing detail

fix: correctly price cache_creation_tokens at 1.25x rate

fix: run copy-web before publish so server includes latest web-dist

feat: dynamic version in sidebar, sync logs for debugging

chore: rename sync button label to Force sync

chore: replace dual sync buttons with single force sync button