Trim tool drops the audio from every trim after the first #3432

Description

On https://cap.so/tools/trim, the first trim of a video keeps its audio, but every later trim in the same visit comes out silent, both after "Trim Again" on the same video and after "Choose Different Video" with a new one. The page shows "Video trimmed successfully!" either way.

Trimming a 6-second MP4 with a 440 Hz tone (H.264 + AAC) on cap.so today, full length each time:

processTrim in apps/web/components/tools/TrimmingTool.tsx routes the preview's audio into the recording by calling audioContext.createMediaElementSource(video) on every trim. The preview <video> stays mounted for the whole visit, and a media element can only ever be connected to one MediaElementAudioSourceNode, so from the second trim on that call throws InvalidStateError. The catch around it logs the error and the recording goes ahead without audio.

Reproduction

1. Open https://cap.so/tools/trim and load a video with sound.
2. Trim it, click Trim Again, and trim it again.
3. The second download has no audio track.

I've opened a PR that fixes this; it's linked below.