Teknium: the ear must always be visible so a user can click to enable
passive listening. If it can't start (missing STT/TTS, deps still
installing, no mic permission), the click surfaces the reason in the
tooltip and the toggle stays off — but the control never disappears.
Removes the 'if (!wake.available && !wake.enabled) return null' hide
branch that made the button vanish on machines where a requirements
probe returned false (the Windows report). The only non-idle state is
paused-for-voice (disabled, in the voice-chat pill), since an active
voice conversation genuinely holds the mic.
Tests updated: 'stays visible when unavailable and not enabled' and
'surfaces the refusal reason in the tooltip, still visible' replace the
old hide assertion. 30 vitest green, tsc + eslint clean.
74fae07d75