ui: voice recorder pulse + TDS styling, wire mic denied error to input bar

- VoiceMessageRecorder recording dot now pulses (reuses pttLivePulse keyframe)
- Added data-voice-recorder / data-voice-rec-dot / data-voice-waveform attributes
  for TDS targeting: green pulsing dot, cyan waveform bars, subtle border in TDS dark
- Wire VoiceMessageRecorder onError to the same input-bar error display used by
  location errors (mic denied, media error surfaces to user instead of silent fail)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/room/RoomInput.tsx

@@ -902,7 +902,13 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
                   <Icon src={Icons.SpaceGlobe} size="100" />
                 )}
               </IconButton>
-              <VoiceMessageRecorder onSend={handleVoiceSend} />
+              <VoiceMessageRecorder
+                onSend={handleVoiceSend}
+                onError={(err) => {
+                  setLocationError(err);
+                  setTimeout(() => setLocationError(null), 4000);
+                }}
+              />
               <IconButton
                 onClick={submit}
                 variant="SurfaceVariant"