Chatglot - Chat Translation

New: Book translation

• Translate the current page of a written book or a book on a lectern with G or the new Translate button. Press again to switch back to the original text.
• Writable books (book and quill) can also be translated with the Translate button. The translation is display-only: the editor is disabled while it is shown, and page contents are never changed.
• The button sits below the vanilla Done row with the same width. It can be hidden with the new "Show book translate button" option (G still works for written books and lecterns).
• Only the current page is sent, and only when you ask for it. Turning pages never sends a request.

Provider reliability

• Translation failures are now classified (auth, missing config, rate limit, quota, timeout, network, server, bad response).
• Temporary failures are retried up to 2 times with backoff, honoring Retry-After.
• Auto-translate pauses briefly after rate limit, quota, or auth errors instead of repeatedly sending requests. Manual translation keeps working.
• Identical in-flight requests are shared instead of being sent twice.

Better error messages

• Errors are localized (English / Japanese) and include a recovery hint, with a link to open settings when relevant.
• Raw API responses are no longer shown in chat; hover the error for details.
• Repeated auto-translate errors are shown at most once every 30 seconds.
• Sign and book translation failures now show the reason.
• New /chatglot diagnose command sends a short test text to the selected provider and reports the result and latency.