feat(autoedit): Use unified diff image for debug panel, improve hot streak display

[umpox]

Description

Image:

Switches from the custom diff implementation to just showing a unified diff image in the debug panel.

1. Fixes bug where lines were ordered correctly
2. Means less horizontal scrolling in vertical panel

Hot streak:

1. Shows status of hot streak chain entries
2. Adds correct discard reason for deferred cursor positions

Test plan

Manually tested on different examples in debug panel