feat: a group box can carry a mark, not just a title (#119)

[lex00]

Closes #119.

GroupBox had a title, a status and an id, but no glyph channel — a box could be titled and never badged. A consumer wanting to mark one box out of many (behold marking the operator's own namespace) had only the title to smuggle it through, and titles are load-bearing: behold's logical lens re-derives namespace <ns> verbatim to re-parent helm releases, so a suffix would silently unparent them.

The field

interface GroupBox {
  // …title, x, y, w, h, depth?, status?, id?
  mark?: string | GlyphSpec;
}

The node mark vocabulary (#95) applied to a box, not a parallel one: a GENERIC_GLYPHS key or a pack's own GlyphSpec ({ body, colored?, viewBox? }). It resolves as an override in resolveGlyph's chain — a box has no lexicon or kind to consult a pack with — so an unknown key degrades to "generic" exactly as it does on a card, and a colored mark paints as authored. No ground is offered: the box fill is painted at fill-opacity 0.6, so pinhole cannot honestly name what the glyph sits over (the same reason the containment views pass none).

Where it paints

The box's top-right gutter: an 18px square inset 18px from the right edge — the mirror of the title's 18px left inset — vertically centred on the title row. Monochrome geometry is stroked in the title's colour, so it follows the theme and picks up the status tint the way the title does. groupMarkMarkup is the single emitter, the way glyphMarkup is for node glyphs.

The morph takes the same GroupBox[], so the mark rides it too, baked relative to the box's right edge (the box resizes between views, so the runtime slides it by the current width). Its panel CSS is narrowed to direct children — .pin-mbox > rect — or the box's own fill would reach into an authored mark's shapes.

Absent = unchanged

Pinned two ways: the exact emitted markup for an unmarked box, and marked.replace(theMark, "") === unmarked — the mark is purely additive.

Checks

npm run tsc, npm test (211 -> 227), npm run build all clean locally.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Rfs1mLVWmwginHnDTg75sG