Added support for failed requests

Right now, certain requests (if they fail) can cause StudioJS to stop working, require a page reload:
- Crop pane - "Crop"
- Faces pane - "Select Faces"
- Redeye pane - "Red eye"

Implementing error handling for these situations may increase code complexity, but would improve durability on poor internet connections.

Start by locating the request handlers for the Crop pane’s “Crop,” Faces pane’s “Select Faces,” and Redeye pane’s “Red eye” actions. Reproduce a failed request in each flow and verify that StudioJS remains usable without a page reload.

Written by the indexing model from the issue text.