Add a Card Search tab and fix horizontal-card (Battle/Plane) preview orientation

Card Search browses the whole downloaded card universe (not just owned
cards), reusing the Library tab's filter/group/sort/list/tiles UI; results
show ownership and offer quick "own" and "add to deck" actions.

Battles, Planes, and Phenomena store their Scryfall image portrait-shaped
with the content itself rotated, so hover/click previews now detect this
(a new `horizontal` flag threaded through ingest and every card query, with
graceful fallback for a reference.db built before the column existed) and
rotate the image back into place. Single-faced and non-DFC cases are
verified fixed; a double-faced Battle's front face still needs another pass.

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

src-tauri/src/lib.rs

@@ -30,8 +30,10 @@ pub fn run() {
             commands::set_owned,
             commands::set_location,
             commands::search_library,
+            commands::search_reference,
             commands::get_library_stats,
             commands::get_library_facets,
+            commands::get_reference_facets,
             commands::list_decks,
             commands::create_deck,
             commands::delete_deck,