macOS UI Improvements

[AvdLee]

[!NOTE]
My previous PR should first be merged. This PR contains changes from that PR (#273). @kean ideally, I'd become a contributor so I can open PRs with different target branches. Let me know what you think!

This PR adds several UI improvements:

• [x] Add helpers to toolbar buttons
• [x] Updated the documentation regarding the mode (see inline comment)
• [x] Hide list scroll background to allow window background to shine through. This enables more customization options.
• [x] Update the console min width to better display network requests on macOS
• [x] Remove window style for macOS demo since the view looked broken:

Fixes https://github.com/AvdLee/RocketSimApp/issues/530

[kean]

I'd become a contributor so I can open PRs with different target branches. Let me know what you think!

Absolutely, I sent an invite!