fix: freezes during longer screen recordings

Closes #131

Fundamentally, we cannot afford to composite webcam and screen on the
client. We should create two streams and then combine them with ffmpeg
processing in the backend / orion.

js/src/features/compose/compose-overlay.tsx

@@ -164,7 +164,6 @@ export function ComposeOverlay({
     stopRecording: stopScreenRecording,
     cancelRecording: cancelScreenRecording,
   } = useScreenRecorder({
-    mode: recordingMode,
     onFinish: (blob, durationMs, mimeType) => {
       setStepSync("reviewing");
       setReviewBlob(blob);