docs: widen Starlight content column on large screens without mid-width TOC regressions

[Copilot]

Starlight’s default central content width is narrow for long-form docs on large displays, but globally increasing it can cause right-rail TOC overflow at intermediate viewport widths. This change increases readable line width only where layout headroom is reliable.

• What changed

  • Added a large-screen-only override for Starlight’s central content column in docs/src/styles/custom.css.
  • Kept existing Starlight customCss integration unchanged (docs/astro.config.mjs already registers ./src/styles/custom.css).

• CSS update

  • Applies at min-width: 1200px.
  • Sets content width to 60rem.

@media (min-width:1200px) {
:root {
--sl-content-width:60rem;
}
}

[Copilot]

Pull request overview

Note

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Updates the docs site styling to increase the maximum readable content width on larger screens.

Changes:

• Adds a new large-screen media query to override --sl-content-width to 60rem.

Show a summary per file

File	Description
docs/src/styles/custom.css	Adds a breakpoint-based override for the docs content width variable.

Copilot's findings

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• Files reviewed: 1/1 changed files
• Comments generated: 1