v2.5.3 — Sense group translation + configurable OpenAI endpoint

New

• SENSE_GROUP detect mode: tap a word and GPT identifies the sense group (semantic chunk / 意群) containing it, then translates just that chunk — not the whole sentence. Word + sentence are sent together so GPT pinpoints the right chunk. Cached per-word on the OCR'd Sentence so repeat taps are instant; mapLatest cancels stale requests as the pointer moves.
• OpenAI dialog now lets you set both a custom Base URL and a custom Model name. Required for third-party OpenAI-compatible proxies that don't route gpt-4o-mini (e.g. proxies that list it in /v1/models but return unknown provider when called — pick a model your proxy genuinely routes, like gpt-5.4-mini).

Fixes

• Retrofit HttpException now logs the error body, so future routing failures (e.g. wrong model, cooldown, auth) are visible in logcat without a packet capture.

Notes

• Debug-signed APK (personal fork).
• Sense group requires an OpenAI key + an OpenAI-compatible endpoint configured in Settings → OpenAI API Key.

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