[CardSearch] Add card completion popups to chats and search fields (#7089)

* Add card completion popups to chats and search fields

Completes @mention and [[card]] in chat, and card names in the deck
editor, EDHREC, Archidekt, card art rules, and user card settings
searches. Pops up a styled list with mana pips and a card image
preview, flipping the list order when the popup opens above the text
field.

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

libcockatrice_models/libcockatrice/models/database/card/card_search_model.h

@@ -15,6 +15,11 @@ class CardSearchModel : public QAbstractListModel
 {
     Q_OBJECT
 public:
+    enum CardSearchRoles
+    {
+        CardInfoRole = Qt::UserRole + 1,
+    };
+
     explicit CardSearchModel(CardDatabaseDisplayModel *sourceModel, QObject *parent = nullptr);
 
     [[nodiscard]] int rowCount(const QModelIndex &parent = QModelIndex()) const override;