Improve sidebar display

[bgravenorst]

Description

Change 1: Improve nav readability by reducing top-level nav emphasis while making the active page and its ancestor path bold for clearer orientation in deep hierarchies.
Change 2: Reduce sidebar parent item prominence and remove the 1900px root font-size breakpoint to eliminate the jarring large-screen typography jump.

Issue(s) fixed

Fixes #2571

Preview

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

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Note

Improves sidebar readability and consistency across screen sizes.

• Demotes level-1 sidebar items (category and link) to font-weight: 400 and font-size: 1.5rem; ensures active item and its ancestor path are bold (700 for level-1, 600 for deeper levels)
• Normalizes active-state selector to .menu__link--active and keeps caret visibility tied to active state
• Removes the @media (min-width: 1900px) html root font-size increase to avoid large-screen typography jump

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Project	Deployment	Review	Updated (UTC)
metamask-docs	Ready	Preview, Comment	Jan 21, 2026 9:00am