[Fonts] Migrate CardText surfaces to theme font role (#7538)

* [Fonts] Migrate CardText surfaces to theme font role

* [Fonts] Keep CardText call sites on the app font and fix px sizes

- CardText's unset fallback is qApp->font() again: only the three counter
  painters (paintNumberEllipse, GeneralCounter, PlayerCounter) were Serif
  before the role existed, and they now ask for it through
  ThemeManager::cardTextFont(). Card names, player names, counters, the
  overlay, the Archidekt and EDHREC labels and the completer delegate keep the
  app font they used before.
- Use setPixelSize for the EDHREC card name (20px) and commander name (28px)
  and details (16px) sizes: the stylesheets said px, and setPointSize made
  them about a third larger.

---------

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

cockatrice/src/game_graphics/board/abstract_graphics_item.cpp

@@ -1,5 +1,7 @@
 #include "abstract_graphics_item.h"
 
+#include "../../interface/theme_manager.h"
+
 #include <QBrush>
 #include <QFont>
 #include <QFontMetrics>
@@ -20,7 +22,7 @@ void AbstractGraphicsItem::paintNumberEllipse(int number,
     painter->save();
 
     QString numStr = QString::number(number);
-    QFont font("Serif");
+    QFont font = themeManager->cardTextFont();
     font.setPixelSize(fontSize);
     font.setWeight(QFont::Bold);