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Before 0.4 every engine was a cloning model, so the instruct UI in the
floating generate box applied the same way everywhere. Commit 3187344
hid the instruct toggle because the mix of new engines landing in 0.4
made it unclear which ones honored the kwarg. With Qwen CustomVoice
now shipping as the only engine actually tuned for instruct-style
control, bring the button back — conditionally, and only for that
engine.
Changes:
• FloatingGenerateBox: SlidersHorizontal toggle button appears left
of Generate when the box is expanded AND engine is
qwen_custom_voice. Clicking it reveals an additive instruct
textarea below the main text field (not a modal swap like the old
version). State persists across engine switches so the toggle
remembers its last position.
• GenerationForm: narrow the instruct FormField's conditional from
`qwen || qwen_custom_voice` to just `qwen_custom_voice`.
• useGenerationForm: narrow supportsInstruct for the same reason.
Base Qwen3-TTS accepts the kwarg but the model itself doesn't honor
it — only CustomVoice was trained for instruction-based style
control.
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>