Make sidebar and page section nav headers more distinct

[Modsofthenation]

Summary

Sidebar section labels and the sticky “On this page” rail were too close in weight/color to the links under them, so the nav read as one muted block.

Changes

• App sidebar: section headers use stronger ink contrast; groups separated with hairline rules and more spacing; links stay muted until hover/active
• On this page rail: clearer label separator, more item spacing, muted inactive vs bold brand active state, slightly wider column

CSS-only; no behavior changes.

  

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