v1.12.0: top bar layout and auto-render

Signed by Mozilla for Firefox 140 or later, plus an unpacked build for Chrome, Edge and Brave.

Firefox: click markdown-pr-sentence-comments-1.12.0.xpi below and allow github.com to install the add-on.

Chrome, Edge, Brave: download markdown-pr-sentence-comments-chrome-1.12.0.zip, unzip it to a folder you keep, open chrome://extensions, switch on Developer mode, and click Load unpacked. For an update, replace the folder contents and click the reload icon on the extension card.

New in this version:

• New layout: a thin bar at the top of the window instead of a window floating over the diff. The page is pushed down, so nothing is covered.
• Panel: the tabs at the left of the bar open the Outline, Threads, Changes and Spec panel. It docks left of the content and pushes it aside, or floats above it (button in the panel header). t opens and closes it, Shift+T resets it.
• Automatic rendering: changed Markdown files are rendered as rich diff when you open the changed files. The round button in the bar switches this off and the choice is remembered.

Based on chienyuanchang/rich-diff-comments (MIT).