[iOS] Recording recovery

I had my first lost recording on iOS today. The app was stuck on the "processing" modal for quite a long time and I force quit it to regain app access. Unfortunatly, no record of the nearly 10 minute recording is there. The app _must_ prioritize never losing data for it to be trustowrthty. At a minimum it should check for any dangling temp recordings or unfinished work at startup and recover those assets.