fix(ui): variable width toc

[avivkeller]

Fixes #9019

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Jul 31, 2026 4:11pm

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PR Summary

Low Risk
CSS-only responsive grid tweaks in the Article container with no logic or data changes.

Overview
On 3xl viewports, the Article container no longer caps width at max-w-10xl and instead uses 3xl:max-w-none so the layout can span the full viewport.

The 3xl grid changes from fixed side tracks (--spacing(80)) to 1fr — fixed 256 spacing — 1fr, giving the sidebar/navigation area flexible outer columns while keeping a defined center width—addressing variable-width table-of-contents behavior on wide screens (#9019).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.12%. Comparing base (efbdb7b) to head (7f71ccd).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9062      +/-   ##
==========================================
+ Coverage   75.06%   75.12%   +0.05%     
==========================================
  Files         102      102              
  Lines        9105     9105              
  Branches      373      372       -1     
==========================================
+ Hits         6835     6840       +5     
+ Misses       2266     2261       -5     
  Partials        4        4              

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📦 Build Size Comparison

Summary

Metric	Value
Old Total First Load JS	7.16 MB
New Total First Load JS	7.16 MB
Delta	0 B (0.00%)

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Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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