[plainprogrammer]

Closes #50

The card page shows how many owned copies are free to use and which decks hold the rest: the stats strip becomes Owned / In decks / Free to use, and a new In decks table after Printings lists the deck zones that hold a copy or a proxy of the card. Spec 073 (approved at Gate A and Gate B), plan, verification.md and the implementation review (Mode B, SPEC-ALIGNED after two rounds) are in docs/specs/073-card-page-deck-stats/.

What changes

• Stats strip (c-stats--three, spec 057's design): Owned (as before), In decks ("in N decks"; decks holding at least one owned copy) and Free to use ("not in a deck"). Considering counts as in a deck. A proxy never changes any of the three.
• "In decks" section: Deck (link to the deck page, format muted beside it), Zone, Owned, Proxy; one row per zone holding a copy or a proxy of the card, summed across printings; decks by comparison key, zones in the deck's order; a muted dash for no proxy; head count "4 copies in 2 decks · 2 proxy"; empty state "This card isn't in any of your decks." with an "Add to deck" link. Zone and the format fold under the deck name below 640px.
• One definition of "free": Lot.free read through Lot::FreeCopies (specs 070 and 071). "In decks" is the card's other lots (Catalog::CardOverview#deck_lots), so Owned = In decks + Free to use and no page code tests a location's kind. Deck::CardUses reads the rows (four statements however many zones; none for a visitor).
• Collector only: a visitor on an open catalog reads nothing (no statement against lots, locations, decks or deck_proxies). Another account's lots, decks and proxies never show (cross-account examples, each with a positive control).
• No schema, migration or export change (format version 4 untouched), no ADR.

Two rulings to confirm (flagged at Gate A, approved)

1. The Proxy column counts proxies of the card in any printing, matching the card-wide Owned.
2. The empty state's "Add to deck" link, and the head count's words ("proxy" has no plural, as the deck pages say it).

CSS and markup (small, all scoped to the section)

Three rules under a (spec 073) heading in additions.css: a deck's name wraps (#in-decks td:first-child); below 640px the head count takes its own line (the deck pages' precedent: a cut count is information lost); the empty-state link stays on one line. "Your copies" takes spec 048's existing c-table__place class on a placed lot's Location cell, because a 60-character deck's "Deck › Zone" label made the page scroll sideways at 1280px (measured: 547px nowrap cell, page 1354px in a 1265px viewport).

Existing examples this changes (listed from a grep, in the spec)

entries_show_spec (spec 071 AC-1.4 rewritten; section order), quick_adds_spec, query_counts_spec (the zone example no longer includes the card page, which has its own bounded-statement example; the placed-lots example re-based, see verification.md), deck_additions_spec (system: two clicks scoped to the head, since the empty state adds a second link of the same name), zone_place_label_spec (the Zone column), deck_core_spec (65 files, including the card page's partials and CardOverview).

Evidence

Factory data, placeholder card images, headless Firefox. Light and dark; the phone shots are a 390px frame (page 375px beside the pinned classic scrollbar). The "before" shots are emulated by injecting the old rule, not built from main. All files are in docs/specs/073-card-page-deck-stats/screenshots/.

Card from the card page to its deck (desktop, phone):

Some copies in decks (7 owned: 3 in two decks, Considering among them, 4 free; two proxies)

desktop, light	desktop, dark

phone, light	phone, dark

No decks (the empty state), all in decks (Free to use 0) and proxies only (Owned 0, a row with the proxy count), each in desktop and phone, light and dark:

state	desktop light	desktop dark	phone light	phone dark
no decks
all in decks
proxies only

Before and after of each CSS or markup fix (60-character deck name at 360px, "Your copies" at 1280px, the head count at 360px, the empty-state link at 390px; light and dark, all in screenshots/ as 05-wrap-*, 06-copies-*, 07-headcount-*, 08-empty-link-*). The head count before/after, 360px, dark and light:

before	after

The 60-character deck name at 360px, before (runs off the table) and after (wraps), and "Your copies" at 1280px before (page 1378px wide) and after:

360px before	360px after

1280px before	1280px after

Tests

• New: Deck::CardUses (7), CardOverview deck readers (3), DecksHelper#card_decks_count_line (2), the card page request examples (25), the card page system examples (20, headless Firefox: widths 360/390/640/1024/1280, both themes, the head count and link) and the no-script path from card to deck (rack_test, 1); guards: the statement-count example (bounded however many lots, decks, zones and proxies; shown red under a mutation), the visitor examples (no statement against the four tables, with a signed-in control), the core-names guard (65 files).
• The suite has 4456 examples. The pre-push hook ran the full bin/ci (RuboCop, YARD, comment ratchet, Brakeman, bundler-audit, importmap audit, RSpec) on ff2e1646 and passed; GitHub CI is the second check.
• Lessons from this run are in docs/lessons/ (and the distillation is committed: both area docs, the index row and the frozen line); the plan is retired after merge.

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