feat(voice): send transcript with the main send button while recording

while dictating, the main send button stops recording, transcribes, and sends
in one tap, matching the codex-style flow. the mic button still stops and drops
the transcript into the input box to edit before sending. voice recording state
is lifted into the composer so both buttons share it, and the send button is
enabled (not grayed) while recording. also fix a pre-existing type error: the
quick-settings preferences map was missing voiceEnabled.

src/components/quick-settings-panel/view/QuickSettingsPanelView.tsx

@@ -27,12 +27,14 @@ export default function QuickSettingsPanelView() {
     showThinking: preferences.showThinking,
     autoScrollToBottom: preferences.autoScrollToBottom,
     sendByCtrlEnter: preferences.sendByCtrlEnter,
+    voiceEnabled: preferences.voiceEnabled,
   }), [
     preferences.autoExpandTools,
     preferences.autoScrollToBottom,
     preferences.sendByCtrlEnter,
     preferences.showRawParameters,
     preferences.showThinking,
+    preferences.voiceEnabled,
   ]);
 
   const handlePreferenceChange = useCallback(