Figure out image downsampling for perf

Right now we don't have a projector, so we're sending the image captured by the phone to the osx app but it's too huge (>3mb) so we need to downsample it before it's bearable (and doesn't crash the app because it runs out of memory)

No file, test, or entry point is named. Start by locating the phone-to-OS X image transfer and its image handling, then check where the oversized payload causes memory pressure. Done means images are downsampled before reaching the OS X app and no longer cause the reported memory crash; the acceptable image size is not specified.

Written by the indexing model from the issue text.