Appearance: Add a full-width option for the composer content

[Blackskyliner]

I did a quick manual search over the discussions, issues and PRs and did not find anything, so I might be the first one who's a bit annoyed by the following:

Currently the Composer window limits the content area to a fixed max-w-3xl.

This might be fine if only working an a standard MacBook display resolution as its almost a perfect fit - with a bit of room to breathe - but wastes possible usable space on 2k or 4k monitors even with sensible resolution or DPI scaling.

This also leads to always having the need to scroll horizontally on tables and outputs even though the screen real estate would be there to just display it.

A implementation seems to be straight forward. Make the max-w-3xl for the content of the Composer optionally disable-able within the appearance settings of the Application.

I get it that most applications also limit this width and designer vision and usability-bla-bla and in IMHO its stupid, let the user decide if he wants overly long lines or not esp. If he might be dealing with content output which naturally scales better on wider outputs.

To be more example driven: A simple request to my checkout "list me all open issues and prs which might be open and tldr me the actionable items" lead to a table which had 3 prosa intense columns which I needed to scroll because of the width limitation even though I had at least 2x the whitespace available to me for potential display of the full table w/o scrolling.

[Garfounkel]

Agreed, this is also a problem for me.