[Fonts] Migrate ChatLog surfaces to theme font role (#7537)

* [Fonts] Migrate ChatLog surfaces to theme font role

* [Fonts] Keep ChatView on the app font and share the report log font

- ChatLog's unset fallback is qApp->font() again: ChatView never set a font
  before the role existed, so an unset role must not switch chat and the game
  log to monospace at the system GeneralFont size.
- Move the monospace fallback the report dialogs used before into
  report_utils::reportLogFont(), which returns the theme's ChatLog role when it
  is set and the old monospace otherwise. tab_report, dlg_my_reports and
  dlg_report_user now share it, so they cannot drift and they honour a themed
  size instead of overriding it.

---------

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

cockatrice/src/interface/theme_manager.cpp

@@ -12,6 +12,7 @@
 #include <QFile>
 #include <QFileInfo>
 #include <QFlags>
+#include <QFontDatabase>
 #include <QGuiApplication>
 #include <QIODevice>
 #include <QLatin1Char>
@@ -658,11 +659,24 @@ QFont ThemeManager::appFont(AppFont::Role role) const
         return it.value();
     }
 
-    // No per-role scaling: every unset role resolves to the application font,
-    // so with no fonts.toml present the result is identical to before.
+    // Role fallbacks preserve the pre-theme defaults when no fonts.toml is
+    // present: card text starts from a serif basis, everything else from the
+    // application font. The report dialogs that used to hardcode monospace ask
+    // for it explicitly (report_utils::reportLogFont).
+    if (role == AppFont::CardText) {
+        return QFont(QStringLiteral("Serif"));
+    }
+
+    // No per-role scaling: every other unset role resolves to the application
+    // font, so with no fonts.toml present the result is identical to before.
     return qApp->font();
 }
 
+bool ThemeManager::hasAppFont(AppFont::Role role) const
+{
+    return currentFonts.fonts.contains(role);
+}
+
 QFont ThemeManager::defaultAppFont(AppFont::Role /*role*/) const
 {
     // No per-role scaling and no preview: an unset role resolves to the font