F1: the availability publish-effect duplicated the #218 editability gate
(editable && inEditMode && !showStatic) inline — a copy that could silently
diverge from the tested isBodyEditable — and the reason computation (the core of
#309) had no tests. Extract computeDictationAvailability into editor-sync-state.ts
REUSING isBodyEditable; the effect is now a one-line call. Unit tests cover the
branches (synced→null; pre-sync disconnected→offline / else connecting;
!editable/!edit→read-only).
F2: DictationGroup gated the mic on the non-reactive editor.isEditable while the
PR already publishes the reactive dictationAvailability.isEditable (same signals)
— so gate and reason came from different sources and the mic could stick. Gate on
dictationAvailability.isEditable: one reactive source of truth for both.
vitest (editor-sync-state + dictation): 37 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
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