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Lotus CIandClaude Opus 5.5 3e11a6fc0b fix(translate): say why Translate did nothing (#287)
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When a message was already in the target language, or its language
could not be detected, Translate switched itself back off with no chip,
no "Translating…" and no error. Show a short toast instead: "This
message is already in English." or "Couldn't tell what language this
message is in, so it wasn't translated."

Fixes #287

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5
 2026-10-18 00:17:04 -04:00
jaredandClaude Opus 4.8 ecb7b1a7fb feat(translation): on-device message translation 
Add per-message translation that runs entirely on-device via the
Chromium built-in Translator + LanguageDetector APIs. Message text
never leaves the machine and never touches a cloud service, preserving
the E2EE guarantee. When the on-device engine is unavailable
(non-Chromium / mobile) the feature simply hides itself; there is no
network fallback.

- Engine abstraction (utils/translation): TranslationEngine interface
  plus a chromeTranslationEngine implementation (feature-detected,
  caches translator/detector instances, download-progress monitor).
  Pure lang-code helpers (normalize/sameLanguage/curated targets) with
  unit tests.
- Settings: translateTargetLang (default English) + autoTranslate
  (opt-in), with a Messages settings tile — a target-language select
  and an auto-translate switch, disabled with a note where unsupported.
- useMessageTranslation hook + shared per-event toggle atom-family and a
  persisted LRU cache so scrollback never re-translates.
- UI: a Translate / Show Original message-menu action, an inline
  "Translated from <lang> - Show original" chip, and a body swap in
  m.text/m.emote/m.notice that renders the translated text through the
  plain-text path (linkify + emoji) inside a dir=auto span for RTL.
- Auto-translate flips foreign messages whose model is already
  downloaded; first-time downloads keep the manual chip (user gesture).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
 2026-07-18 16:08:40 -04:00