fix(cards): resolve glued combined multi-face names in image lookup

[JacobWoodson]

Summary

Makes the deck-builder image/type lookup resolve glued combined multi-face names ("Front//Back", no spaces) so they render their art instead of a text-tile fallback.

fetchCardData (via resolveNameLookupKey in scryfall.ts) does a direct key lookup into the local card-data map. That map keys multi-face cards by oracle id, spaced display name ("front // back"), and front-face name — never the glued form. So a card entered as a hand-typed glued combined name missed every key and threw "Card not in local data", falling back to a text tile. (The engine still resolved the card via its own // split, so the deck loaded — only the thumbnail was lost.)

Fix

Add a front-face fallback to resolveNameLookupKey: when a // name isn't a direct or diacritic-folded key, split on // and resolve the front face, which the export always indexes. This mirrors the engine's card_db lookup_key behavior, so the display layer and the engine agree.

A single-faced card whose own printed name contains // (e.g. SP//dr, Piloted by Peni) is itself a primary key and hits the exact-match path first, so it is never mis-split.

Verification

scryfall (vitest): the three new tests pass —

• a glued combined name ("Peter Parker//The Amazing Spider-Man") resolves to the card entry via the front face;
• the canonical spaced form still resolves directly;
• a single-faced //-in-name card ("SP//dr, Piloted by Peni") resolves to itself, not mis-split.

tsc -b --noEmit is clean. (Two unrelated pre-existing tests in this file shell out to gen-scryfall-*.sh and need jq/bash, absent in my local env — they don't touch this code path.)

Relationship to #4790

Independent of, but complementary to, the #4790 deck-parser fix. That PR stops corrupting //-in-name cards during parsing; this PR hardens the display layer so any glued combined name (from old saved decks, unusual paste sources, or a future import source) shows its art. Neither depends on the other.

🤖 Generated with Claude Code

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[matthewevans]

Thanks for the follow-up in your first contribution set. This neatly closes the display-side case by resolving hand-typed glued multi-face names without regressing real // names like SP//dr, Piloted by Peni.

[matthewevans]

Maintainer review: ready. The Scryfall lookup fallback is ordered correctly, covered, and CI is green.