When the user disables auto_refine (LLM polish) in Settings, the Qwen
refinement model is no longer required for dictation to arm. Previously,
canRecord checked llmReady unconditionally, so useChordSync called
disable_hotkey whenever Qwen was not downloaded -- even if the user
never intended to use refinement.
Changes:
- useDictationReadiness: gate llmReady behind autoRefine in canRecord,
missing, and the polling predicates so hotkeys arm with just Whisper
STT when refinement is off.
- DictationReadinessChecklist: hide the LLM row when autoRefine is
false -- the checklist now shows only Whisper STT.
Closes#753
