Better Snap Feedback

Snap doesn't have good feedback. For example, when taking a selfie, there was no flash or sound. I had to verify a picture was taken in Files.

We could:

- Flash the window, like screenshot.
- Use the camera sound.
- Show a filmstrip of thumbnails taken since the session started: click the photo to view it with Photos directly.
- Even use a notification.

When recording:

- show a red dot when recording
- Make a beep.
- Make a thumbnail (labeled video or pictures)
- Show key frames every so often in a filmstrip.
- be able to launch audience to view the video directly.