The SPEECH_RATE=1.2 constant was added to speed up the somewhat slow MiMo
voicedesign voice. With StepFun preset voices (whose tempo is already
appropriate) and no per-provider logic, a global 1.2x is no longer the
right default. Remove the constant and all 4 of its uses:
- the constant declaration + comment
- two `el.playbackRate = SPEECH_RATE` assignments (audio now plays at 1.0)
- the typewriter pacing divisor (`/ SPEECH_RATE`) — audio and text both
return to original duration, staying in lockstep
A future user-facing speech-speed setting (UI control + persisted pref)
would be a separate feature with a different shape; no placeholder kept.
yuanzonghao
17341cbd4a