Add a card details info tile to the click-to-preview modal

Shows type line, mana value/colors, price, per-format legality pills,
and ownership context (owned copies, decks it's in) when the caller
has that data — LibraryCard/DeckEntry rows do, bare CardRefs don't, so
the section just omits itself when absent.

The info tile sits beside the card art via flex-wrap and drops to its
own line on narrow viewports, rather than shrinking either face to
make room. Also shrinks a double-faced Battle's rotated front face
when it has a sibling back face, so it no longer renders at
full single-card size next to a much smaller back face.

src/api.ts

@@ -38,6 +38,18 @@ export interface DeckEntry extends CardRef {
   quantity_owned: number;
 }
 
+/**
+ * A `CardRef` plus whatever ownership context the caller happens to have
+ * (present on `LibraryCard`/`DeckEntry`, absent on a bare `CardRef`). The
+ * click-to-preview modal's info tile renders these fields when present and
+ * omits them otherwise — callers don't need to do anything special, since
+ * `LibraryCard`/`DeckEntry`/`CardRef` are all structurally assignable here.
+ */
+export type PreviewCard = CardRef & {
+  quantity_owned?: number;
+  decks?: string[];
+};
+
 export interface Deck {
   id: number;
   name: string;