v0.86.2: the admin design-refinement arc — one calm visual system, a real phone desk

0.86.2

Changed

• The admin's visual system, re-expressed end to end by the design-refinement arc (2026-07-15).
  The office: an emphasis ladder replaces per-element accents (ink-solid standing openers, violet
  reserved for flow commits and pending act-on states, red only inside destructive confirms, amber
  only on needs-attention), one status-pill family with a shared wash, one-line list rows composed
  at a natural reading measure with tinted frame zones, and a documented proximity spacing scale.
  The type system: the wordmark and every display-face heading drop negative tracking (the rn pair
  kemmed — "Cairn" could read "Caim"), chrome steps to 15px, the manuscript's prose posture opens
  to 1.125rem/1.85, and small labels take tracking bands keyed to optical size and weight. The
  desk: below the sm breakpoint the edit route recomposes for the phone — a 48px band, Save and
  Publish in a thumb-reach bottom action bar padded above the screen edge, one scrollable
  44px-target toolbar row, and the environment strip folded into the overflow — cutting
  keyboard-open chrome from 67% of the viewport to 34%. The toolbar gains Format / Structure /
  Insert group eyebrows and a persistent Markdown-help control at every width. Tidy's review diff
  and settings examples are colorless (weight and strikethrough carry the semantics), and dark
  mode compensates saturation with a lower-chroma primary (contrast measured above the 4.5:1 floor
  throughout). All of this is admin-internal CSS and components; no consumer action.
• The showcase exemplar moves its custom Signups entry from the Content section to the Site
  section of its declared navLayout (signups are inbound visitor data, not authored content),
  and the organize-your-admin-nav guide's worked example follows. Exemplar and docs only.

Added

• A resolved engine nav entry now carries dated when it is a content concept, and the admin
  sidebar gives dated concepts (Posts-like) their own glyph so adjacent concepts stop sharing one
  document icon. Additive; no consumer action.

Fixed

• The admin shell zeroes the browser's default body margin while mounted. On a host site that
  never resets body, the fixed sidebar pinned to the true viewport while the page content
  offset by the UA's 8px margin, opening a visible seam around the brand tile and adding 16px of
  permanent scroll under the full-height drawer. The reset lives and dies with the admin mount,
  so the host's own pages are untouched. Automatic; no consumer action.