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/components/VoiceMessageRecorder.tsx

@@ -185,6 +185,7 @@ export function VoiceMessageRecorder({ onSend, onError }: VoiceRecorderProps) {
   if (state === 'recording') {
     return (
       <Box
+        data-voice-recorder="recording"
         alignItems="Center"
         gap="200"
         style={{
@@ -194,18 +195,21 @@ export function VoiceMessageRecorder({ onSend, onError }: VoiceRecorderProps) {
         }}
       >
         <Box
+          data-voice-rec-dot
           style={{
             width: toRem(8),
             height: toRem(8),
             borderRadius: '50%',
             background: 'var(--tc-danger-normal)',
             flexShrink: 0,
+            animation: 'pttLivePulse 900ms ease-in-out infinite',
           }}
         />
         <Text size="T200" style={{ minWidth: toRem(32), fontVariantNumeric: 'tabular-nums' }}>
           {formatDuration(durationMs)}
         </Text>
         <Box
+          data-voice-waveform
           alignItems="Center"
           gap="100"
           style={{ height: toRem(20), overflow: 'hidden', flexShrink: 0 }}

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"