Dub Studio 2.2.1 — critical download fix + karaoke transcript

2.2.1 — critical download fix

🛠️ Fixed: alternative models downloaded corrupted. The alt-quant models (Gemma Q5/Q6/Q8, Higgs, Roformer, Parakeet) moved to Hugging Face's new Xet storage, which drops connections under parallel download — the files came down with holes and llama-server failed to load them (invalid magic characters '????'). Now they download correctly:

• range retries with backoff, lower connection concurrency for Xet;
• download to a .part file, validated (exact size + GGUF magic) and only then renamed — a corrupt/interrupted download can no longer pass as "installed";
• fixed a Parakeet manifest typo (encoder-model.onnx_data → .onnx.data).

Verified end-to-end through the app: all alternative models download valid, and the Gemma Q8 quant loads and translates in the real dubbing pipeline.

🎬 Transcript mode — karaoke play-along: a play button, video, and highlighting of the current line/word as it plays.

🌍 Processing status now follows the interface language (was hardcoded Russian).

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🔄 Auto-update: 2.1.0 / 2.2.0 will offer to update.