Translate across 24 directed offline Opus-MT language pairs (English-centric, every model id verified) with swap-direction that carries the output into the input, per-panel character counts, copy-with-confirmation, and cancel. Resolves the Chrome Translator API when available (zero download) and automatically falls back to the pair's Opus-MT Transformers.js model behind an explicit download gate, with a truthful provider badge. No model bytes download until an explicit in-block action.