Setting for main-panel content width (allow full-width chat column)

[danielo515]

The thread view's content column is capped at 760px (max-w-[760px]). On a wide display that leaves a lot of unused space, especially for diffs, tables and code blocks.

Would it be possible to expose this as a setting — e.g. Settings → Appearance with narrow / wide / full, or bb settings general contentMaxWidth <value>? Today the only workaround is a custom theme overriding the utility class, which breaks whenever you switch palettes.

I searched for existing issues and found only table-related ones (#1705, #3269), so filing this separately.

Thanks for bb — it's excellent.

[bb-slop-cop]

🚨 SLOP COP 🚨 · new-issue-autopilot

Applied Type: Feature, Priority: Low, Effort: Low, and label: ui. No existing classifications were replaced.

This adds a contained appearance preference. No reproduction report or pull request: this is a feature request, so the bug-only steps do not apply.