F3: add computeDictationAvailability assertions for the read-only ∩ pre-sync
intersection (editable:false, inEditMode:true, showStatic:true) → read-only for
both isDisconnected states, pinning that lack of edit permission takes
precedence over the pre-sync reason (kills a mutant dropping `editable &&`).
F4: switching native disabled → data-disabled made a disabled mic hoverable — good
for the byline mic (shows the reason), but a consumer passing bare `disabled`
without a reason (AI chat's isStreaming) got a misleading, actionable
"Start dictation" tooltip on a click-rejecting control. Now: disabled + no reason
→ render the icon with NO Tooltip and a neutral aria-label; disabled + reason →
reason tooltip; enabled → "Start dictation". Click guard/data-disabled preserved.
F5: remove the dead "busy" DictationUnavailableReason (never produced) — union
member, its resolver case (folded into default), and the vacuous test assert.
vitest (dictation + editor-sync + dictation-group): 41 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
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