Document sidebar and topbar styling options

[mintlify]

Summary

• Added documentation for styling.sidebar.items option with values container, card, border, undecorated
• Added documentation for styling.topbar.style option with values gradient, default
• Updated all localized versions (Spanish, French, Chinese)

These new configuration options allow users to customize the visual appearance of sidebar navigation items and topbar styling in their documentation.

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Note

Low Risk
Documentation-only changes with no impact to runtime behavior or configuration parsing.

Overview
Documents new docs.json visual styling options under styling: adds styling.sidebar.items (with container/card/border/undecorated) and styling.topbar.style (with gradient/default) to the settings reference.

Updates the Spanish, French, and Chinese localized settings.mdx pages to match, including a small French punctuation fix in the styling.eyebrows description.

^{Written by Cursor Bugbot for commit 869ef67. This will update automatically on new commits. Configure here.}