Tone the dark mode dividers back down

[aashu2006]

#115 raised --border to 3:1 for #99, but every divider on the site uses
it, so the lines under the navbar and between sections turned bright
grey. WCAG 1.4.11 only asks for 3:1 on outlines you need to find a
control, and those use --input (inputs, selects, outline buttons), which
stays at about 3.1:1. --border goes to 22% lightness, about 1.6:1: still
visible, unlike the 1.3:1 before #115, but quiet.

The contrast test now checks --input, the token the rule applies to.

Summary by CodeRabbit

• Visual Improvements
  • Dark-mode section divider borders are now darker, making them less prominent against the surrounding interface. Input control outlines remain unchanged, preserving their separate visual treatment. These updates apply to both standard content dividers and sidebar dividers.

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