Add a "not owned" quick filter and horizontal tile view to Card Search

"Not owned" moves into the shared Quick filters icon-toggle row (hidden on
the Library tab, where it'd always be a no-op since that view is owned-only
already) instead of a standalone button.

Tiles view gains a "Horizontal" toggle that rotates actually-horizontal
cards (Battles, Planes, Phenomena) into their natural landscape orientation
via a container-query-sized wrapper, spanning two grid columns so the
rotated card isn't squeezed into a single portrait column's width and left
too small to read.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/api.ts

@@ -130,6 +130,9 @@ export interface LibraryFilter {
   power_max?: number | null;
   toughness_min?: number | null;
   toughness_max?: number | null;
+  /** Only cards with zero owned copies. Only honored by `searchReference`
+   *  (`searchLibrary` already returns owned cards exclusively). */
+  not_owned?: boolean;
 }
 
 export interface Status {