Cancel Transcription

[oenu]

need to support cancelling a transcription (especially useful for long transcriptions)

• [ ] Send a message to interrupt the child process (this might require passing the child process out of the RunWhisper handler as it is stuck inside a promise. Maybe an IPC listener to reject the promise?)
• [ ] Clean up the resulting files/state in redux
• [ ] Communicate to the user that the transcription has been cancelled