Deck shape panel: mana curve, card types and coloured mana symbols #256

Outcome. A deck page shows the deck's shape at a glance, drawn from the catalog: its mana curve, its counts by card type, and how many coloured mana symbols its costs ask for.

• Depends on Store each card's mana value from the catalog #250, Deck page: owned cards by zone #253 and Proxies: add, change and remove a proxy in a deck zone #254.
• MTG extension code, shown in the deck page's right column (DeckShape).
• Counts Main and Commander only (not Sideboard or Considering), owned copies and proxies together, the curve split between them.
• Curve columns 0–6+ with lands left out, and the average mana value; types by top-level type; coloured mana symbols W/U/B/R/G (hybrid symbols count toward each of their colours; the spec settles Phyrexian and double-faced cards).

A candidate from the roadmap, scoped in the decks and locations issue design (2026-11-09). It is refined into a spec when its turn comes, and checked then against the north star's hosted-door rules and spec rules (one outcome, one PR; a spec that adds collector-owned data extends the export in the same PR).