Deck shape panel: layout at extreme counts #320

Outcome. The deck shape panel (DeckShape) stays tidy at the extreme counts a large deck or collection can reach, on a phone and on a desktop.

Spec 069 (#256) built the panel on spec 060's CSS and found four layout limits that show only at extreme counts. They are documented in docs/design-system/components/DeckShape.md and in docs/specs/069-deck-shape-panel/verification.md (Findings):

• The curve's 6+ column: in a 360px browser frame (not on a real 360px phone, which is 15px wider inside: see the 2026-11-11 phone-width lesson and Narrow-frame helper misses overflow hidden by a scrollbar's width #318), a four-digit count ("1,357") overflows its column by about 1.85px.
• The mana bar's labels crowd when all five colour segments carry four-digit counts.
• A type row's count goes out of line when its proxy suffix is wider than 4.5rem.
• The caption can wrap with a leading "· " at the start of its second line.

Decide per item whether to fix it (abbreviate large counts, let the curve's labels shrink or wrap, widen the suffix column, use a separator that doesn't lead a line) or accept it as a documented limit. Changes go in additions.css under the DeckShape heading, with design-system tokens only, plus DeckShape.md. Examples use spec 069's worst-case fixtures at 375px (a 360px phone), 640px and 1280px in both themes, with screenshots before and after.

A follow-up from spec 069's implementation review (#256, 2026-11-11), filed by the maintainer's ruling. It is refined into a spec when its turn comes, and checked then against the north star's rules.