Use the full terminal width to display diffs

[remorses]

Right now opencode does not use the full terminal width to display changes made by the model, this has poor readability.

[wienans]

For me I also always see inline diffs. But I saw in a poste that @thdxr has side by side diff https://x.com/thdxr/status/1938424854249906263 so likely only a config thing.

But I don’t know how

[remorses]

I was getting the side by side diff too in a previous version but even those where centered and limited in width, I would prefer it to use the full terminal width instead

[adamdotdevin]

there's a new command (/files) where you can see latest diff of any file. this is going to be leveraged in some more useful features soon.

[adamdotdevin]

carrying on in #525