Align CI fixtures with safe dubbing and compact Electron documentation

docs/feature-catalog.md

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+# Features and engines
+
+Engine availability depends on installed models, hardware, and configured providers.
+
+## Features
+
+- **Voice Cloning**
+- **Voice Design**
+- **Video Dubbing**
+- **Dictation Widget**
+- **Vocal Isolation**
+- **Speaker Diarization**
+- **Batch Queue**
+- **MCP Server**
+- **AI Watermark**
+- **Local-first**
+- **GPU Auto-Detect**
+- **Remote Model Downloads**
+- **Extensible**
+
+## Speech generation
+
+- **VoiceStudio** (default, powered by k2-fsa/OmniVoice)
+- omnivoice-subprocess — [Guide](engines/omnivoice-subprocess.md)
+- CosyVoice 3 — [Guide](engines/cosyvoice.md)
+- KittenTTS
+- MLX-Audio
+- VoxCPM2
+- MOSS-TTS-Nano
+- gpt-sovits
+- sherpa-onnx
+- **IndexTTS 2.5** ⚡ — [Guide](engines/indextts.md)
+- omnivoice-gguf
+- supertonic3
+- **MOSS-TTS-v1.5** — [Guide](engines/moss-tts-v15.md)
+- **dots.tts** — [Guide](engines/dots-tts.md)
+- **Confucius4-TTS** — [Guide](engines/confucius4-tts.md)
+- pockettts
+- audiocpp — [Guide](engines/audio-cpp.md)
+
+## Transcription
+
+- **WhisperX** (default)
+- Faster-Whisper
+- MLX Whisper
+- PyTorch Whisper
+- Parakeet TDT
+- Parakeet TDT v3 (MLX)
+- Moonshine
+- FunASR
+- **sherpa-onnx** (live dictation)
+- **OpenAI-compatible** ⚠️ configured server